[Review] Glock G45, Gen 5 G17 MOS, & G19 MOS

Glock just released three new models to flesh out the 9mm line! 

They are the G45 and Gen 5 versions of the G19 MOS, and G17 MOS.

A very limited number of folks were able to try out these new heaters from Glock before they hit the shelves.  

Now luckily you, the faithful readers of Pew Pew Tactical…will be in the know.

excited shaq
Are you excited? I’m excited!

Table of Contents

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G19 & G17 – Upgraded and Modernized

Glock started the Gen 5 rollouts a while back with the G34 and G26.  Both are excellent choices in 9mm, one (G34) being the big daddy long-slide competitor and the other (G26) being the stubby concealed carry or backup gun.  

Gen 5 essentially meant the guns all shared some common traits.

First, they were coated in a diamond-hard nDLC finish which is super black.  This exterior is tough and also have lubricious properties.

In addition, the Gen 5’s were given the Glock Marksmen Barrel, promising improved accuracy.  One of my favorite upgrades was the flared and beveled magwell, greatly aiding in reloads. The trigger was better, being smoother and having a quicker reset.  

Glock 19 and 17 gen 5 MOS
Concealed or duty carry, the G19 MOS (left) and G17 MOS (right) have you covered.

Plus, the magazine was given an orange follower which visibly indicated an empty chamber as well as showing you how many rounds were present in the magazine.

The Gen 5 G17 and G19 MOS were just added to the line.  These are likely two of the most prolific handgun models in the world right now and their Gen 5 MOS upgraded versions are a credit to their lineage.  

Glock MOS with Trijicon RMR and Buris Fastfire 3
The Trijicon RMR Type 2 (left) and Burris Fastfire 3 (right) are great MOS options.

They are still essentially the same, the G19 being the compact version, and the G17 being the full-size, though they benefit from the Gen 5 enhancements and something new – forward slide serrations!

If you’re unaware, some shooters enjoy forward slide serrations because they allow the user to press check and even reload with their support hand not dropping the rear of the slide.  

With a reload, the shooter simply grabs the slide up front, pushes the gun forward, releases the slide, then marries up grip with both hands.

This is as opposed to racking the slide (support hand) from the rear with the gun hand driving forward, forcing your support hand to recover grip from being further behind the gun.

G45 – The Latest in Glock Evolution

It’s not a .45 caliber.  This is an issue for some people though it is lost on me.  Glock has never produced a model number that coincided with a caliber of the same number.  But while we’re here in Distractionville, check out the G41, it is a tack-driving, 230-grain delivery system.  

New Glock 45
The G45 is an evolution from the G19X appealing to the needs of law enforcement.

When the new Gen 5 Glocks released, another impressive idea from the Austrian gun manufacturer came out simultaneously—the G19X.  This gun was the result of Glock attempting to fill the requirements for the U.S. Army’s MHS contract.

Glock called the G19X a crossover, a combination of the G19 slide with the frame of the G17.  

Why?  The idea was you’d get the concealability of the G19’s shorter slide with the expanded capacity and grip of the G17, a marriage made in heaven.  

In response, many people professed to want a blending reared of the opposite values, namely; a long slide with a shorter handle.

The Army ultimately selected the Sig P320 with what can only be described as mixed results due to a drop safety concern which Sig ultimately corrected.  The FBI still selected Glocks to fill their 9mm needs and this chain of events may have inspired Glock to reach out to one of its larger markets, law enforcement.

The G45 takes the idea of the G19X crossover, combines it with the upgrades common to the Gen 5 series, and then enhances it with forward slide serrations.  It is a wonderful combination that is largely targeted to that law enforcement market.

The gun is black, unlike its predecessor, has the frame of the G17, and the slide of the G19.  For specifics, the slide on the G45 is 6.85 inches according to the Glock website.

The G17 Gen 5 MOS FS has a slide of 7.32 inches… roughly half an inch longer so we’re not talking enormous differences.  

However, when it comes to grip, size is critical.

My gloves are 2X, and this means if I don’t use at least the “M” size backstrap add-on piece with the extended beavertail (since Gen 4) I will be experiencing some slide bite.  

With the G17 frame, this is less of a problem. Regardless, Glock has you covered as the fit is adjustable.

Pistols at Ten Paces!

Call me a fanboy, but at this point in my life if Glock made something that didn’t just perform I would be surprised.  

Flaired Magwell
The gaping maw of the Gen 5 magwell just begs for reloads.

Please keep in mind that I am not a concealed carrier only. I have served in law enforcement for 20 years now and have utilized firearms professionally for that duration.  I’ve never understood faulting someone for praising something that absolutely works, other than the tribalism that seems so rampant in our modern society.

That being said, I had a chance to take all three guns out to the range and wring them out before many of you will even see them on the shelves.  In short, they hold up to Glock standards, which are high in my opinion.

I ran a few different brands of ammo through them and found them to be wholly reliable.  This wasn’t an exhaustive test, but an introduction. Don’t forget to look at the Best 9mm Ammo for Self-Defense & the Range.

Under Cut Trigger Guard
The smoothed-out trigger will impress previous Gen Glock shooters and the reset is surprising!

The G45 handled similarly to the G19X I had tested before.  I am a big fan of the flared magwell though, and the forward slide serrations.  This just makes sense to me.

I was able to engage my target at various distances and reload using the flared magwell in conjunction with the forward serrations.  Ultimately, I believe this process will become faster for me with practice.

The benefits of the crossover were evident to me immediately, I was able to maintain a substantial grip on the weapon without slide bite and it was still small enough to conceal with minimal effort.  Let’s be honest, this isn’t a bikini gun, but you can tuck it away with some planning.

I had good accuracy with the standard Glock sights, though this is always a minimum standard and can be improved upon.

The Gen 5 G19 and G17 MOS were impressive.  Individually, I mounted the Trijicon RMR Type 2 on each gun for testing.  

Best Pistol Red Dot

By the Numbers

I use this micro-red-dot on my Gen 4 G17 duty carry and am very familiar with it.  On the G19 it was dead on and I punched a ragged hole in my target. On the G17 it was slightly left for some reason and I still punched an ever-growing, ragged hole in my target.  I find the MOS system allows me quicker sight picture and recovery after recoil.

Ergonomics: 4/5

As I mentioned above, I have had other guns just fit my hand better out of the box.  That being said, the newer generations of Glocks do a great job of fitting a wide variety of hand shapes.  And for those who are left-handed, the Glock can be converted to suit you!

Accuracy: 5/5

I have hit man-sized targets with my Gen 4 Glock at 100 yards.  This is not optimal for obvious reasons. With any luck, if I’m shooting that far, I’ll have a rifle in my hands.  All this aside, the Glock Marksman Barrel is supposed to be capable of putting up 4-inch groups at 50 yards. That’s impressive.

Reliability: 6/5

While Glock isn’t the most beautiful firearm in the world, it is one of the most reliable.  You can bury them in the ground, drag them through the mud, even hold them underwater, and they will still work.  I have had some high-end pistols that were finicky with ammo, the Glock shoots everything I’ve thrown at it.

Customization: 5/5

Because of the sheer amount of these guns in the world, there is a large aftermarket, meaning there is a lot of customization options.  Sure, you can add a flashlight, laser, whatever you want to the rail, but when it comes to actual customization, the Glock is top of the heap.  

There are so many companies doing custom frame stippling, slide milling, hell, the whole P80 market is due in some part to the success of various Glock models.

If you’re interested in building your own Polymer80 Glock, we got you covered! But they won’t come in the G45…yet! We also got the Best Glock Mods and the best Glock Magaiznes!

Looks: 3/5

As much as I like Glocks, I have to be honest.  They aren’t as attractive to me aesthetically, as say a 1911.  However, they are terribly functional, and that is an aesthetic in and of itself.  Function > Form.

Price & Value: 4/5

While I have not seen MSRP on these models yet, I feel like Glock does a great job with creating value.  If performance and all other aspects are the same, the price of these guns is incredibly competitive compared to other companies.

I’m Your Huckleberry

Some folks will react to the news of new Glocks with a “meh” mentality.  I fall into the other category. I use my tools professionally and think any advantage I can gain in a possible gun fight is an investment worth making!  If I never have to use it, so much the better. But if Valhalla should call upon me some day I shall not go lacking to my adversaries.

Glock backstrap
I understand this doesn’t apply to everyone, but you big-handed shooters out there, use the Glock backstrap with the extended beavertail, you’ll thank me later.

Irrespective of your position on Glocks, these three new models are some of the best offerings you can find on the current handgun market in my opinion.  Many of the features seen on these models are a direct result of Glock’s watching the aftermarket and seeing what customers want.

Glock reports the new pistols are shipping out now and will be on gun store shelves starting October 5th.  I can give them each my full recommendation, having fired them all.  

The Gen 5 models, having been upgraded with forward serrations and flared magwells, are outstanding editions to anyone who carries, be it out of a sense of self-defense, or professionally in the defense of others.  

If you do plan on getting one of these new offerings from Glock,  don’t forget to look at our 4 Best Pistol Red Dots article to find the right optic for it!

What do you think about the new G45? The Gen 5 in general? What about the MOS Glocks?! Tell us in the comments!

30 Leave a Reply

  • Michele

    I think Glock lacks innovation. They really haven't made any improvements to their guns. The trigger guards are still too small, the finger groove under the trigger guard is old fashioned and inadequate, the hump at the bottom of the backstrap is still providing their pistols with ergonomics that don't work for people who are not fan boys. And the "Marksman barrel" is a joke. No one is buying this thing for precision shooting. Glock will round the corners more on their next Gen. and call it an improvement.

    6 months ago
  • JohnnyJ

    When is there going to be a G19 GEN5MOS without the MOS?

    7 months ago
  • roger

    The wait continues for my Glock Unicorn...G26 slide/barrel (with forward serrations, nDLC coating) married to a Gen 5 G19 receiver (of course short enough to fit the reduced slide length but with the Gen 5 frame features: flared mag well, removed finger ridges, etc...).

    8 months ago
  • JohnnyJ

    My main concern on the MOS model is just how reliable are the threads going to be? Will the threads strip? Loosen? Backout? How much purchase? How much abuse will the threads/plates take? Would it be better to mill the slide? How much better is a milled slide? And finally, who does the best milled slide and retreating the metal to look OEM?

    9 months ago
    • Sean Curtis

      Johnny, I've carried the Gen 4 G17 MOS on duty for a little over a year and have had no issues with threads whatsoever. I've switched out optics and changed mounting plates and had no problems. I also shoot quite a bit so my gun is no safe queen. Using blue Loctite likely helps with this. I can't compare it to having a slide milled by a gunsmith as I've never done that, but there is some motivation to move to the Gen 5 in my mind anyway since you get some other great upgrades. Hope this helps.

      9 months ago
  • Jim

    Pew pew (Eric)this is the most bombastic review I have ever seen. While I enjoy a plethora of informative firearms articles this one had no more useful content then a mans love for Glock. I think it is awesome the writer got to shoot these frankenguns <—-(cheap shot) before the rest of us even seen them, but the way it was articulated was no more then boasting. I could have understood taking a jab at the competition if this were a Glock vs Sig review, but in the context of this article it was nothing more then an ego bloating cheap shot. Also if your guest writers are going to rate something using a scale maybe you should start with a 10 scale, even us less fortunate and far less knowledgeable folks know 10 is a perfect score. Eric I have enjoyed your website, downloaded some of the free targets you offer , read many of your reviews and put some stock in your opinions. I have only pointed out a few of the misgivings I have about this article, there is so much more pertinent information that could have been gleaned and passed along. For transparency: I own Glocks and Sigs. I don’t have any issues with taking either of them into a battle. Along with a few others as well. No I don’t write or talk like this in normal everyday interactions, I made an exception for this one.

    9 months ago
    • Dave

      Jim, You sound more like someone who is trolling for an argument rather than making a good one. Your “argument “ is really just negative criticism that is, imho, unsupported. BTW, I could read your post and take it more seriously if you would learn the difference between the words “then” and “than”

      8 months ago
    • Michelle

      I didn’t see boasting here. Curtis knows Glocks and - from what I can tell - appreciates their value. Bottom line - they’re reliable, shoot smoothly, and if they aren’t the prettiest gun, which is an opinion, then whatever. You don’t have to nitpick. I think he gave a “plethora” of valuable info for prospective buyer.

      8 months ago
    • Sean Curtis

      Jim, I’ll add another word to your description—evocative, based on your reaction. I won’t address all the issues you’ve raised but I wasn’t taking a cheap shot at Sig. If you read the surrounding paragraphs, you’d see I referenced the MHS contract and the G19X as Glock’s entry. Their failure to win this bid led to them having a surplus of these weapons, so they sold them to the public. As I pointed out, the G45 is a result of marrying the G19X with some of the Gen 5 features. As far as Sig is concerned, I think they make fine weapons, some of the best in the world in fact. However, as a writer, I also have a responsibility to point out recalls… and that happened Jim, neither of us can change it. Go in peace sir. I mean you no ill will in spite of your acrimony.

      9 months ago
  • ETCSS

    Hopefully I'll have some first hand experience with the G45 by Monday...picking one up on Friday!

    9 months ago
  • Ryan P Towey

    Actually Glock has produced another model that coencideds with a caliber. The glock 40. But I'm nitpicking, great article.

    9 months ago
    • ETCSS

      The G40 is a 10mm, but I'm nitpicking, too! LOL!

      9 months ago
  • Lightnin MN

    Writer is just a Gun Snob !

    9 months ago
    • Sean Curtis

      Lightnin, I just might be, but could you define it so we're on the same page?

      9 months ago
  • Joe

    Zooming in on the 19 MOS picture, it appears that the front cutout has been removed from the magwell. Can anyone confirm?

    9 months ago
    • Frank

      Looks like it was removed on both the 19MOS and the 17 MOS.

      2 months ago
    • Sean Curtis

      Joe, It most definitely has. I think the chief complaint that got back to Glock was that it pinched fingers for some shooters, even though it was intended to offer better purchase for mag removal.

      9 months ago
    • Thatguy

      Yes it has

      9 months ago
  • Rich R.

    G26 magwell with G19/17 slide length would be great. Will accept all Glock 9mm staggered mags. (Including G26 mags) Use adapters for full grip if think you need. Just personally myself would love that option.

    9 months ago
  • SoBe

    I will agree that the Gen 5 are the best Glocks ever. However, I believe that one is biased by experience and training and not always in an "evidenced based" way. I have my favorite instruments in surgery and another surgeon has another set; neither of us is right although we accomplish the same. I grew up with Colt 1911's custom gun smithed for an Olympic shooter, my grandfather. This is the Gold Standard of triggers for me. In modern pistols, only SIG comes close, HN is not far away but factory Glocks are on another galaxy and custom Glock triggers are in another solar system, barely even close. I love my Glock, and also my antique 1911 and SIGs, yet shoot these latter many times better and with negligible malfunctions versus the Glock

    9 months ago
    • Sean Curtis

      Doc, First off, thanks for your service! I agree with a lot of what you said. I wrote a review of a Kimber recently that I carried on duty. I really like that gun. I'm happy to admit I tried a Sig P226 Tacops one time and it was amazing. I didn't care for the DA/SA, but the fit to my hand was amazing, the trigger was butter, and the accuracy was beyond par. Regarding bias. This is true to a large extent. We are a collection of our own experiences. It reminds me of an old Chinese proverb: “There are many paths to the top of the mountain, but the view is always the same.” Though please rest assured, if I had a bad experience with any weapon, I will report that as well.

      9 months ago
  • Duke Aquaro

    Okay, this is a Glock that I may not dislike. It appears to be well balanced. I do like forward slide serrations. I do like the wide mouth mag well. I do like......I don't know what else I do like. I still do not own a Glock. But this really does interest me. I know it is reliable and accurate. So...maybe. There is always a first time....

    10 months ago
    • Sean Curtis

      Duke, Thanks for stopping by. One of the best arguments in favor of Glock is the value for the money. I'd suggest heading to a gun store and renting a few models to try.

      9 months ago
  • Terp

    I'm one of those you mentioned who thinks Glock got it bassackwards—we need a G17 slide and its longer sight radius coupled with a smaller G19 frame and its shorter grip. I'm surprised they didn't pull out all the stops and breakout the lanyard loop again on this *thing*. I don't care what you say; she is sexy, though. :)

    10 months ago
    • Franco

      Yeah, I never really got the whole concept of extra concealability with a bigger grip, the part that...duh...generally is exposed and a shorter slide/barrel, the part that...duh...is concealed inside the waistband. I’ve been carrying concealed for over 25 yrs. Am I missing something? I’ll wait for the Glock “Z”.....a G19 long slide.

      9 months ago
      • Eric

        Brownells offers a 17 length slide for the 19 frame. Only gen 3 though, but I understand not mismatching unproven slides.

        9 months ago
      • SoBe

        Soon, we expect a Glock 99z, (PS, they are named in order of release) basically a bigger SIG P365 with better marketing (after all what does Glock do best?) with polymer magazines (Glock does not understand that the polymer makes the magazines take up more space meaning less space for bang sticks), that still would fit no more than 9+1, horrible sights that would cost 20% of the purchase price to upgrade, an abominable trigger that would cost close to 50% of purchase price to up grade, and which will still have failures to eject, light striker issues, etc, , since Glocks are perfect and their users are shamed into believing any failures are their own fault.

        9 months ago
        • BJI

          My Glock 35 Gen 3 is has fewer than a hand of fingers failure to eject and NEVER had a light primer strike and shoots MUCH BETTER than I can hold . That includes the original .40 S&W barrel and 9mm and .357 SIG barrels.

          6 months ago
        • John

          I own both Glocks and Sigs and I love them all. No malfunctions with either. Glock’s trigger feels bad only when I really focus on it. If I am shooting live ammo and I focus on my target, I don’t notice. I actually shoot my G17 gen 4 better than my FNH FNS 9 or any striker fired handgun I have tried. When I get into the subcompact family it’s a different story, I prefer my single action Sig P938.

          9 months ago
        • Sean Curtis

          SoBe, Such vitriol! I haven't had any experiences like this but I can respect yours.

          9 months ago
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