What’s one of the most popular new guns in the last ten years?
I’ll give you a hint: It’s mostly just a fun range toy and practically useless outside that niche.
Our mystery gun is also hard to control, deals heavy recoil, and has stoked passionate debate in the tactical community since its release.
Some love it, some hate it, and most cry, “Just upgrade it!” That’s right! Let’s open Door #1 and talk about our friend, the Mossberg 590 Shockwave (full review).
When scouring the internet, you’ll likely come across reviews highlighting the pros and cons of the meme-worthy Shockwave.
But there is one point everyone can agree on: This model can go from greatly useless to remarkably useful with just a few clever upgrades.
My goal when constructing the Ultimate Shockwave build was to improve the original design by making it more effective as a firearm and easier to use.
I also wanted to keep the gun nice and lightweight.
Today, I will run through my upgrade process step-by-step, from braces to grips to slings.
By the time we’re done, you should be able to build your own Ultimate Shockwave. And if you dream up a nifty Frankenwave build of your own while reading, please share it in the comments section!
Table of Contents
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Is the Shockwave a Firearm or Shotgun?
The Mossberg 590 Shockwave is a unique gun model that benefits from bizarre legal loopholes.
For instance, this powerful and compact firearm is technically not a shotgun—no, not even a short-barreled shotgun!
Per US law, a shotgun is designed to be fired from the shoulder and must have (or previously had—you know, semantics) a stock.
Our Mossberg darling is not equipped with a stock, just a Shockwave Raptor grip.
By this technicality, the Shockwave is legally a close-quarter firearm with the giddy oomph of a shotgun, but in a smaller and more maneuverable package.
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Prices accurate at time of writing
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As a firearm, the Shockwave is not restricted in barrel length so long as the gun’s total overall length is 26” or more. Anything less could be considered a concealable weapon, which is subject to the National Firearms Act.
And that’s the detail I kept in mind when designing the Ultimate Shockwave build.
Best Shockwave Upgrades
Stock Adapter
“Travis,” you might ask. “Surely, the best improvement is to add a stock?”
Absolutely, yes! But remember, that violates the National Firearms Act. We have to keep it legal. We’re upgrading a firearm, not a short-barreled shotgun.
So, let’s talk about the next best thing: adding a stabilizing brace.
A brace allows you to anchor the weapon to your forearm, reducing the recoil and mitigating many of the control issues associated with the original Shockwave design.
I also recommend using an Ergo Grip Mossberg 500/590 Tactical Stock Adapter. It bolts directly onto your Mossberg Shockwave and gives you the ability to equip an AR-15 pistol grip and an AR-15 receiver extension.
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Prices accurate at time of writing
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For my Ultimate Shockwave build, I added a brace and an old A2 pistol grip that was languishing in storage.
Admittedly, a pistol grip makes the safety less ergonomic, but it’s still reachable with a wide thumb grip.
If you want to keep things simple, SB Tactical sells a 590-SBL Stabilizing Brace Kit complete with adapter, SBL brace, and pistol grip.
The SBL brace can’t be adjusted, but it does the job as a cheap plug and play item until you’re ready to throw more money at your Shockwave.
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Prices accurate at time of writing
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Brace Yourself with the SBA3
The SB Tactical SBA3 Stabilizing Brace is one of my favorite braces for 12 gauge firearms.
Not only is it slim, sleek, and lightweight, it also allows for five different positions in which to anchor the gun against your wrist or forearm!
Pretty nifty, right?
The SBA3 is very comfortable to use and offers a QD point, making it easy to sling. It can also withstand the recoil of a 12 gauge firearm without any problems.
I know looks aren’t important when it comes to functionality, but I’m spoiled when it comes to my gear, and I find the slim design very appealing.
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Prices accurate at time of writing
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XS Sight Systems Big Dot Tritium Sight
Bead sights are easy to use, easy to see, and on a weapon like the Shockwave, they work reasonably well.
But you have better options.
One simple but significant upgrade to the Mossberg Shockwave is swapping out the factory bead for an XS Sight Systems Big Dot Tritium Sight.
Despite its name, this product is roughly the same size as a standard bead and is manufactured with an easy-to-see white ring surrounding a tritium vial.
This unique design functions to improve your sight acquisition speed under any light conditions, day or night.
In other words, you’ll be able to quickly and easily engage your target, even in low light settings.
Good news: The installation process is easy, and the XS package comes with all the necessary parts you’ll need to affix the upgrade to your gun.
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Prices accurate at time of writing
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Ditch the Factory Pump
I like the idea behind Mossberg’s pump with a strap, but I can’t say I’m a fan of the execution. The screws securing the strap to the pump dig into my hand and cause serious pain whenever I’m firing buckshot loads.
So, I quickly ditched the factory pump for an Ergo Mossberg Forend M-LOK, and I have no regrets to this day.
Check out those M-LOK slots!
It’s cool. It’s handy. What’s not to love?
The Ergo Mossberg Forend M-LOK fits properly on the Shockwave and, despite its all-metal construction, is very compact and lightweight.
Its squarish design also offers a good grip that allows you to manipulate the weapon with confidence.
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Prices accurate at time of writing
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If you’re planning to use your Shockwave for home defense, you need to equip a trustworthy light.
Lucky for you (and me), this product provides plenty of M-LOK slots to mount lights, lasers, rails, and more to the weapon.
Now, about that light…
Streamlight, You Light Up My Life
There are plenty of light options, and everyone has their favorites. The beauty of the Ultimate Shockwave build is that you can attach a light directly on the M-LOK and get down to business.
For my build, I mounted a Streamlight TLR-1 HL Tactical Flashlight to my Shockwave.
The Streamlight TLR-1 HL is a full-sized tactical weapon light that’s sold in various lumen outputs.
I selected the model with 800-lumens because it’s a powerful little number that’s also compact and lightweight—the two critical elements of my upgrade design.
Plus, it has easy to access controls that work perfectly with my Shockwave setup.
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When it comes to home defense, you need a product that’s reliable in a sticky situation.
At 800-lumens, the Streamlight TLR-1 HL is more than bright enough for inside the home, and it can take a serious beating.
If I’m identifying a target in the dark, I trust the Streamlight to keep working after suffering the abuse and recoil of a 12 gauge shot.
Can’t ask for more than that!
All About the Grip
You’re going to need a little background information to understand my choice of grip.
I suffer from chronic pain due to a nasty shoulder injury, so I find foregrips to be a bit uncomfortable, especially when it comes to firing pump-action weapons that require repetitive motion.
To mitigate the pain, I tend to prefer angled foregrips and vertical grips on my guns.
The IMI Defense Front Support Grip is an angled foregrip that is both supportive and comfortable to use.
When shooting 12 gauge pump-action weapons, I employ a push-pull method that requires a strong grip to reduce the recoil (and pain). The IMI Defense Front Support Grip facilitates this practice and helps me enjoy a fun day at the range.
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Prices accurate at time of writing
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While the IMI Defense Front Support Grip is an excellent foregrip, it’s hardly the only product on the market.
A Magpul AFG2 Angled Foregrip could easily fill this role, and BCM makes some awesome stubby grips. The new SIG Tread M-LOK Grip Kit is also a great option.
The One Sling to Rule My Shockwave
I have a confession to make: I’m a Blue Force Gear Vickers Sling fanatic.
This disclaimer is not an exaggeration; in fact, I factor in the price of a BFG sling whenever I purchase a new gun.
Equip your Ultimate Shockwave with the sling it deserves.
But I promise these slings are worthy of my biased love and devotion. What can I say? BFG has never let me down.
When I got out of the USMC in 2013, I took my BFG Vickers Sling with me as a memento. I used this sling for a good portion of my career, which included a rough year-long deployment.
That sling is now equipped to an AR-15 and still enjoys regular use. Can there be a better endorsement?
When I was plotting my upgrades list, I knew a BSG sling was going to make the cut. And not just any sling, but the ONE Sling, which is aptly named because for my Shockwave, it is the one sling to rule them all.
The One Sling is a 1-inch strip of webbing that’s perfect for a lightweight, versatile, and low-profile build.
This two-point sling is comfortable to wear, weighs 23% less than similar Vickers products, and is equipped with rapidly adjusting pull tabs.
We need to discuss the magical pull tabs.
You can grip or rip the pull tabs to instantly change the length of the sling. For example, it can tighten to the point where you can let go of the gun and use both hands, and then, in a flash, loosen up to a length that maximizes mobility.
What? It’s super cool. Try it and see.
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Prices accurate at time of writing
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Bonus Round: Your Shockwave Wants the OPSol Mini-Clip 2.0
The last upgrade I made to my Mossberg 590 Shockwave was equipping the OPSol Mini-Clip 2.0.
This adapter is a simple drop-in device that lets your gun feed those adorable 1.75” mini shells with reliable gusto.
It’s an optional upgrade, but certainly worthy of your time and money.
Sure, the factory Shockwave model feeds mini shells well enough without the clip, but it’s hardly dependable or consistent. And it’s incomparable to the joy you’ll experience after installing the OPSol Mini-Clip 2.0.
Want more good news? The installation process is a breeze.
The little wedge drops in easily and is tough enough to take some serious use and abuse.
It’s a simple and ingenious design that works perfectly with the Mossberg 590 series and our Ultimate Shockwave build.
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Feel the Shockwave
Ready to start building an Ultimate Shockwave of your own? You won’t regret it!
The construction of the Ultimate Shockwave build started as a mission to make the gun useful, lightweight, and simple to use.
Not to brag, but I think I’ve successfully hit all three targets. The weapon is now easier to handle, more comfortable to shoot, and boy does it pack a formidable punch.
Plus, the weapon is still over 26” in length, so there aren’t any NFA issues to worry about!
Ready to start constructing your own Ultimate Shockwave? What upgrades are you planning? Let us know below.
And if you’re interested in exploring more ideas, check out The Best Mossberg 500 and 590 Upgrades.
Tell us about your upgrade successes and failures (these are fun too!) in the comments.
41 Leave a Reply
The job of the tactical community is to teach one how to think tactically. Not teach one how to purchase.
Got a shickwave for Christmas...What kick? My 870 pistol grip and UTG Folding stock kicked worse than this "range toy". In 20 gauge, the recoil is soft enough that my 8 year old daughter can dump all 6 rounds, on target, in under 10 seconds, and she's NOT a regular shooter. Get the brace kit, although I prefer the Kak Industries flavor of stabilizer over the SBA choices. SBA is nice, but the Kak, the Kak is solidly a performer for bracing or stabilizing your shockwave.
Could not find a brace kit at Kak. Do you have an item number for it?
The Shockwave does not kick as bad as everyone says it can be aimed and fired I was nervous to fire mine after buying it and seeing all the warnings about how bad it was, adding to this was the fact that i had a pinched nerve in my neck that seriously reduced the strength in my right arm but i fired it aiming with the bead sight without problem with both 2 3/4 and 1 3/4 shells.
I just bought one and added the Crimson Trace laser and really like that. Has anyone considered adding a sling swivel to the factory grip cap and a belt clip to carry the gun on a heavy nylon reinforced handgun belt? I bought a 55 round bandolier and added a sling stud to the bandolier. With a sling swivel on the gun I can use dog lease heavy clip and hang the shotgun from the bandolier. Now I can quickly throw the bandolier over my shoulder and patrol my acerage at night, hands free, with the shotgun just hanging my my side. Looking for the coyotes that killed my wife's little lap dog but not yet. However, if those noxious critters come around again within range, I intend to follow the old adage -- "Coyotes found here at night will be found here in the morning".
since the safety is on the top ridge of the firearm..... after adding the pistol grip, does it make it harder to reach the safety button?
It seems to me the Shockwave without modifications is meant to be a "shoot from the hip" weapon. If that's true, my primary interest would be to add a laser (for aiming from the hip) and a good light.
Although you could use the Shockwave, firing from the hip and with many hours of practice, you might become semi proficient at hitting your target?
All firearms (shotguns included) are designed to be aimed at your target.
Shotguns don’t spread as much as people may think, until you are aiming at long range targets, which shotguns are not really designed for. It’s very easy to miss a target with a shotgun if you do not take “careful aim.”
I just purchased the 20 gauge version of the Mossberg 590 Shockwave - do all of these accessories fit both the 12 and 20 gauge versions, and, is there a video anywhere that explains how to install them?
Tim, I have the 20 also and looked up each item in the list. All should fit except the opsol mini clip and maybe the Ergo forend M-lok. Some reviews say the Ergo didn't fit due to the length of 6.94". Everything else fits on rails or is glued on (the sight) so should work.
How's that Ergo forend holding up?
Seems like an excellent option to me, but the lack of reviews/pics online has me a bit spooked... That and the fact nowhere has one in stock for me to see it in person.
I love my shockwave. My only issue is the safety switch digging into the area between my thumb and hand, especially with the buckshot.
I find it humorous that so many initial reviews called the Shockwave a useless range toy - the same epithet the AR Pistol was graced with when shooters first acknowledged they exist. Now? Numerous online reviews say exactly the opposite - that the short legal length is exactly what can be a blessing when using it in close quarters. That's the exact reason so many carry a handgun - no room to maneuver a Garand or field gun, you transition to a hand gun.
Mindset - I said Garand for a reason. I was an early adopter of the HK91 in the 70's, and I continue to see how newer firearms can do better than traditional arms that are popular only because they are used by LEO's and demonstrated so ably in competition. As a student of the Infantry School, however, it was a main point of instruction to think OUT OF THE BOX to get the upper hand in a situation. If that takes using a 14" 12G with no stock for personal security, why not?
Because so many are trapped in their training and experience, they can't expand their envelope and explore alternative methods. Americans tend to be about 20 years behind on state of the art - and it's hard to merchandise oneself as an expert if the newer firearms weren't part of the initial training or education. It's easier to just trash talk things casting them in a light as if they are unprofessional rather than think thru the entire point of their existence.
As of this writing I'm finding it hard to source a Shockwave - at all - because after a few years of reviews by those who found the positives, the public is now gung ho for using them in personal defense, the primary reason they exist. In a suburban environment, traveling, or wilderness hiking, they have the power and range to stop an attack as needed. And do so more covertly than slinging a .30-06 or AR15 - especially out of season or where prohibited.
It's time to review the Shockwave again, sans all the McGruber add ons, and consider how it can be appropriately applied to our defense. I consider it a superior replacement for the 1911 in HD, and at the ranges involved, more than adequate at stopping an intrusion. For some jurisdictions, the political overtones would be another satisfactory reason, along with the reduced penetration others are seemingly overly concerned.
With that in mind, I always keep in mind that NO firearm is a "toy" and using the term to describe one is definitely not a responsible way to class them. I have yet to see anybody volunteer to have a loaded "range toy" pointed at them - well, maybe some in the dead of night - but even they recognize they could be dead in the night. It's not the gun, it's the bullet that does the work, and coming up with new bullet launchers is exactly how the firearms makers stay in business.
Can I install a Mossberg ATI Talon 6-Position Adjustable Stock on my Mossberg 590 Shockwave?
ATI says that it fits:
12 Gauge Mossberg 500, 535, 590, 590A1, 590M, 835, and Maverick 88 models.
ATI also says that it's "Not recommended for 590 Shockwave or 590M Shockwave"
Does ATI mean that it is unsafe and Mossberg does not recommend installing the Mossberg ATI Talon 6-Position Adjustable Stock on the Mossberg 590 Shockwave?
Or does it mean that IT WILL NOT FIT THE Mossberg 590 Shockwave?
Please advise.
Mick A, If I'm not mistaken, that ATI Talon is an actual stock, not a brace, therefore it will require registering your firearm as an NFA short barreled shotgun (SBS) with the $200 tax and filing the proper forms. The SBA3 that was installed in this excellent article is not a stock but an arm brace which does not require the NFA registration (ast least not yet).
Mine is the magazine fed version. Even though that big 10 rd mag is bulky, it's perfect for a truck gun as I can keep loaded mags handy and drop 10 more rounds in, in a couple of seconds. I will use the SB tactical brace, but am planning on an optic, I think the Meprolight M21 Day/Night Sight. I haven't used these before, but like the idea of not needing batteries ever, for something that will rattle around in my truck allot. I am also thinking of putting on a perforated barrel from Brownells for recoil reduction. Firing from inside a vehicle, in an emergency, recoil management is key. I welcome feedback.
dhoff,
Regarding the perffed barrel, it will help a bit with full power buckshot loads but it comes with the penalty of putting a LOT of sound back at you as the barrel perforations act basically like a muzzle brake. If you've shot any rifles or handguns with brakes installed, you'll know what I'm speaking of. In the closed cab of a truck, you might find that it's not worth it. A possible option would be to install the Opsol adapter and use the minishells. My Shockwave is set up like that and I don't feel the need for the extra recoil reduction with those loads.
I've just finished putting the Ergo adapter and grip with the SBA3 brace on mine. Was planning to put the XS Big Dot sight on mine but didn't know how it would work with the Crimson Trace laser installed which wraps over the top of the receiver. I thought the laser might interfere with the sight picture but it looks like it will be ok so that's the final piece for mine.
BTW, I have the Streamlight forend which puts out a lot of light. I'm a firm believer in high power flashlights as they are powerful deterrents as they not only identify the target, they also temporarily blind the would be assailant without causing any long term damage.
Of course these are all personal choices and you need to go with what feels right for you.
Good luck with your build!
What picatinny rails did you use for the ergo forend? I can't seem to find any compatible ones at my local D&B Supply.
So, Im in the middle of my Shockwave's upgrades. Ive added the Ergo reciever adapter, SB3 adjustable brace, and Magpul a2 pistol grip. What is the name/nomenclature of the Hogue frontend adapter (mentioned in a Shockwave upgrade list on here) that will allow me to add the Magpul 500/590 forend without dremel-ing the forend?
You should note the standard length ergo friend will not fit the shockwave . You must order the short one . Good luck with optics planet.
Just one man's opinion, but I think y'all are missing the point. If you want / need a big, tactical riot shotgun, then buy one. Mossberg, Remington and Winchester all have them available cheaper than this Shockwave. The Shockwave, et. al. seem to me to be a purpose built item, designed for a specific purpose, at which it EXCELLS. Short Range, GetthehellOFFAME, raw firepower, for which a "real" shotgun would be bumping into everything. 20 - 25 yard maximum, nasty firepower in a handy room clearing package. I'll add a light, and K.I.S.S. This little handful of nasty works for me.
Exactly!
I think it’s the fact that you can legally own the Shockwave without a tax stamp and do the upgrades and have a shorter maneuverable firearm with shotgun power that is not considered a shotgun . With upgrades you will have about 550/600 bucks into a very good firearm .
An interesting upgrade path! But...would it not be simpler and cheaper to buy a standard configuration Mossberg 590? Even the upgrade 590A1 can be had for under $600, which would be less than the cost of the Shockwave, brace, and adapter.
If you were okay with a longer OAL, then yes the normal 590 is awesome! But by using a Shockwave you're able to get a firearm with a shorter barrel and a brace without running into NFA laws.
Yes sir! And I own a few 590s! But this was a bit of a fun project to get something short and fun
I hate the fact that these Pew Pew Tactical articles let you know how many comments have been posted, but will not let you see those comments without FIRST posting a new comment.
So, OK, this is a useless comment so that I can see the other comments.
Hello! Ya, we're looking into that... not sure why it is doing that all of a sudden :(
Thanks for the article. Very informative as there is a lot of misinformation floating around about the Shockwave and its legality, especially with an added pistol brace and grip. I purchased mine, did some extensive research, and added the following upgrades/MODS, which to my knowledge, are ATF/NFA compliant. There is a ton of ambiguous information flying around the internet regarding the Shockwave, but after personally speaking with SB Tactical and Mossberg, I'm 100% certain that my MODS are NFA compliant. Now to my MODS: #1. Leapers UTG Green Bull-dot Laser Sight (This sight is a tank. Easy to hold zero at CQB ranges (5-25 yds) and holds up to extreme punishment). #2. Ergo Adapter w/Mil-Spec Buffer Tube. #3. Gisselle Buffer Spring Assembly (The SBA4 sadly does not come with a buffer spring assembly). #4. SBA4 Tactical Pistol Brace. #5. NDZ Enhanced Slide Safety (tough aluminum construction that greatly enhances my grip and ability to switch the safety on/off from the ready position. So MUCH easier to operate than the stock plastic safety). #6. Monstrum Aluminum 5 Shot Side Saddle w/Picatinny Rail (Solid as a rock, but not built for speed reloads). #7. Ergo Overmolded AR Grip (comfortable as hell, and better in hand than the Hogue and Wilson AR grips I had lying around). Overall, this "firearm" is awesome! It's devastatingly powerful in a home defense situation or at CQB range, and will most certainly incapacitate/devastate/destroy anything within 25 yards at center mass with 00 buckshot or slugs. The spread is minimal with tight groupings, which is comforting as I live in an apartment with thin walls). On my first trip to the range after adding my MODS, everyone stopped to ask me what I was shooting, as my Shockwave was obliterating the targets at 10-25 yards (and that was with target loads of small buckshot). Once I loaded the 00 Buck and rifled slugs, game over, and less recoil oddly enough? I've shot Benelli's most of my life, but LOVE this firearm. It's simply well made, elegant, mean as f%$#@, and unapologetically effective. More importantly, at CQB range, it's extremely accurate and equally devastating. With the addition of the pistol brace, it's as effective as a standard 590, without the added weight and longer barrel length (I personally prefer the shorter barrel for maneuverability). The only downside is the recoil. Even with the MODS, my "shoulder" was black and blue from putting 100 rounds downrange. Hopefully, I can improve my stance and mitigate recoil. Future MODS are a Blackhawk Knox Breachers Grip (to mitigate recoil per Pew Pew's excellent review), and tactical light (Highly recommend the O-Light). Thanks for listening. Pew Pew, or Boo-Ya rather!
The problem with this "upgrade" from the birdshead grip to the wrist-breaker pistol grip and the so-called brace is that it too violates the NFA.
Not by being a stock, but by being an unnecessary accessory.
Because it is an accessory that is not an essential part of the firearm, it doesn't count towards the overall length of the gun. The ATF has already ruled that braces no not count towards OAL on ARs because they are an accessory -- the buffer tube does count because it is an essential functional part of the AR, but the brace does not count towards OAL. There is no way that the same logic would not apply here.
If the brace doesn't count towards the OAL, your "upgraded" shockwave is no longer a non-NFA firearm, the instant it fell below the magic 26" overall length it became an AOW -- and in this case, an unregistered AOW.
But, of course, you guys are the experts and I'm just a poor country bumpkin who spent his career as an Administrative Officer with the federal government responsible for interpreting, implementing, and writing regulations, so obviously you know more about this than I do.
Since you KNOW that your "upgraded" shockwave is legal, feel free to drop by your local ATF office where they can confirm that for you.
If you add an SBA4 or SBA3 Pistol Brace with the Ergo adapter to the Shockwave, the OAL is more than 26" (on my Shockwave, it's 28"). That is if you are accurately measuring from the tip of the muzzle to the end of the buffer tube, which is not an "accessory" per the ATF. Definitely not trying to discount your wisdom, experience, or knowledge, just making a point from my understanding of the NFA rules. Please correct me if I'm mistaken, as the rules are very "grey".
Remington literally sells a braced version of the Remington Tac 14. A company called Black Aces Tactical has been selling braced 12 gauge firearms longer than all of them.
G&GG and SB Tactical sell kits made specifically for firearms.
There are dozens of small vendors that sell braced 12 gauge firearms and display them all over SHOT. Do you know who is at shot? The ATF.
In fact, all the ATF has said about braces on firearms is that they measured in their shortest configuration.
You are spreading misinformation and should do more research.
A Crimson Trace laser for the 590 made "aiming" painless. It's not bulky and activates easily with the stock bird's head grip.
Let me know if you guys have any questions
Is $550 a good price for a shockwave with 2 extra stocks. A mini shell adapter. And about $200 of ammo? Plz answer ASAP please!
This reminds me of the old bathtub racers that would try to one-up their competition every year until they all had what were essentially Formulae 1 cars with bathtubs strapped on top...(this does look like a good 590 mod though..).
I put a light and a red dot, Easier to aim, will welcome anyone that wants to try to get in!
Will any of this work on the 20 ga model?
Thanks!
Is the Shockwave receiver tapped for a 590 rail? I would want to add an optic.
Yes. You can add a Pic rail. I highly recommend the Monstrum Side Saddle and Pic rail. Takes 5 min to install and will easily accommodate most Pic Rail mountable optics. Easy peasy.
How has that Monstrum rail/saddle held up? I ordered one and it felt like it would shake apart after a hundred rounds or so, so I sent it back and got a separate rail and saddle (this is on a Mossberg 500, not a shockwave).