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Best Multi-Caliber Weapons [Rifles, Shotguns & Handguns]

Want more bang for your buck? Grab a multi-caliber weapon! We have a rundown of the best ones we think deserve your attention.

Who wants to shoot just one caliber?

Modularity is a defining factor of many modern firearms, and a big chunk of modularity is the ability to swap calibers.

Lots of AR-15 Uppers
AR-15, the king of modularity — or is it?

As we’ve seen in relatively peaceful times, your favorite ammo can dry up in a hurry. Swapping calibers can be vital for putting food on the table, training, and even self-defense.

The prepper side of my brain says more options are always better than less, and being able to swap calibers is undoubtedly a handy thing to have when the zombies come knocking.

Finding your favorite snack during the zombie apocalypse can be a problem — matching ammo to your gun doesn’t have to be.

While It’s true that with enough tools, expertise, and machinery, you can turn dang near any gun into something multi-caliber, that’s not what we are talking about today.

We are talking about common weapons where the end-user can easily swap calibers without custom work.

Common Rifle Calibers
Common Rifle Calibers

So with that in mind, I’ve gathered what I think are the best multi-caliber weapons currently on the market that are easy for the end-user to swap calibers, starting with the weapons that have the least amount of caliber swaps to the most.

Summary of Our Top Picks

  1. Best Multi-Caliber Pistol

    Sig Sauer P320C

    FCU can easily swap to another frame and you can swap calibers with an X-Change Kit.

  2. Best Multi-Caliber Revolver

    Taurus 692

    Swappable cylindrs means you have options when it comes to calibers

  3. Best Multi-Caliber Compact

    Glock G29

    Subcompact size, can swap to .40 S&W, .357 SIG, 9x25mm Dillon, and .50 GI.

  4. Best Multi-Caliber Shotgun

    SAVAGE STEVENS M301 12 Gauge

    Calibers sleeves mean you can swap to .22 LR, 9mm, .38 Special, .45 ACP, .45 Colt

  5. Editor's Pick

    AR-15 Rifles

    The Legos of the gun world, easily swap barrels, uppers, or drop in conversion kit

Best Multi-Caliber Weapons

1. Sig Sauer P320

Sig designed the P320 to be a modular platform. That was always the intention, and that idea dates back to the original and somewhat underrated P250.

They wanted to maximize the use of their FCU — Fire Control Unit.

The M17 is a formidable weapon designed to operate in the military theater
The U.S. military put out a tender for a modular pistol, and Sig won the contract with their P320 (adopted as the M17).

The FCU is the serialized portion of the gun, thus making it legally the firearm. This allows the FCU to be moved into different frames and work with various slide and barrel lengths.

In addition to being able to move from full size to subcompact, the P320 can also swap calibers.

If you own a P320 in .40 S&W, you can purchase what’s known as a Caliber X-Change kit to swap your caliber from .40 S&W to .357 SIG or 9mm fairly easily.

Some kits require more than others, but typically you get a new slide, barrel, frame, and magazine.

Best Multi-Caliber Pistol
474
at EuroOptic

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

Swapping between frames and calibers is easy and can be done in about two minutes without needing tools. Sig had a great idea, but it’s at the top of the list because they’ve seemed to abandon it.

Sadly, Sig never moved past these calibers and seems stuck here. Moving from 9/40/.357 SIG to .45 ACP or 10mm is an option.

Available Coupons

The Caliber X-Change kits are also fairly expensive, and for a few dollars more, you could purchase a second firearm rather than swap calibers.

2. Taurus 692

The Taurus 692 is all kinds of cool. It’s a 7-shot revolver that allows you to swap cylinders.

One cylinder will enable you to fire .38 Special and .357 Magnum, and the other allows you to fire 9mm.

Taurus 692
The 692 Tracker with the .357 Magnum and 9mm cylinders. (Photo: Michaelbane.tv)

Having one revolver fire three calibers makes it an excellent choice for various applications.

The 692 comes in various sizes, from models designed for concealed carry all the way up to weapons perfect for hunting. Taurus added porting to the barrel to increase control and reduce recoil, as well as an adjustable rear sight.

Sprinkle in an extra shot for a seven-round capacity, and you get a very capable revolver.

Best Multi-Caliber Revolver
593
at Kygunco

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

With .38 Special, you get a very soft shooting caliber.

If you want to shoot cheap ammunition but also have a good selection of various defensive loadings, 9mm has you covered. In the .357 Magnum department, we get a flat shooting caliber that is capable of defense and excellent for hunting small to medium game.

Popular Pistol Calibers
Popular Pistol Calibers

I think the 3-inch barreled model is the most versatile, but shooters can also pick from 2.5 to 6.5-inch options.

With the 692, you get a versatile revolver that’s also affordable. Being able to switch between 3 calibers isn’t bad for a budget-friendly handgun.

3. “Most” 1911s

With such an illustrious history and long lifespan, the 1911 has been offered in many different calibers. It is also a gun that’s easy to convert to a different caliber.

Some 1911s
The 1911 platform has offered shooters a wide variety of calibers and configurations for decades.

Of course, with millions of 1911s produced, some are bound to work better than others with various calibers.

Thus the “most” caveat in the title. How easy it is to swap between calibers depends on what caliber your 1911 was originally chambered in.

1911 in a CrossBreed SuperTuck
1911 in a CrossBreed SuperTuck

Moving from a .45 ACP to another caliber takes the most effort and essentially requires an entirely new slide and magazine.

Going from 9mm to .38 Super or 10mm to 40 S&W is much simpler, being as easy as a barrel, recoil spring, and magazine swap.

479
at Sportsman's Warehouse

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

Swapping from 9mm to 10mm will take a new slide, and so will changing from any caliber to .22 LR.

Luckily with the wide availability of 1911 parts and the extremely common frame, you can make it happen fairly quickly.

You can even swap in various oddball calibers, like .22 TCM or .50 GI. Sure it requires some creativity and a little know-how, but it’s not too intensive or difficult to mix things up with your 1911.

4. FK BRNO

When someone says a new gun is revolutionary, I typically roll my eyes.

Sure, I’m betting whatever new striker-fired polymer 9mm is revolutionary. However, with the FK BRNO PSD, they were right, and it’s awesome.

The FK BRNO PSD with (left to right) 9mm, .40 S&W, 10mm, and 7.5 FK rounds. (Photo: Topshotdustin)

Its unique 7.5 FK round hits some spicy velocities and is flatter shooting than just about any other pistol cartridge.

The BRNO has an interesting and unique design, but its ability to swap calibers has put it on this list.

You can swap between 7.5 BRNO to 10mm, .40 S&W, and 9mm with the purchase of the necessary parts.

FK BRNO 7.5 Field Pistol (National Interest)
The FK BRNO is also offered in a complete metal-framed model called dubbed the “Field Pistol.” (Photo: Nationalinterest)

It might not be cheap, but it’s a damn fine pistol. To be fair, plenty of 2011s cost more than the BRNO and don’t offer near the flexibility of this gun. Imagine using 7.5 BRNO to kill a deer 50 yards away, then swapping to 9mm for self-defense use.

Whether you are target shooting, hunting, or stuck in the zombie apocalypse, that versatility can be handy.

5. Glock 20 & 29

As crazy as it is to say, Glocks are a lot like 1911s in a sense. Their popularity ensures a robust aftermarket that includes caliber conversions.

Glock 20 Target and Ammo
There isn’t much that 10mm can’t take care of as far as pistols go, but sometimes it is nice to have something a bit cheaper and easier.

I could pick any number of Glocks, but the Glock 20 and 29 pack the most potential for swapping calibers. You start with 10mm, and anything with a similar breech face is a simple conversion.

Calibers you can easily move to include .40 S&W, .357 SIG, 9x25mm Dillon, and .50 GI. Rimfire replacement slides also exist. These are the standard conversions that work with no issue.

579
at Brownells

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

There is also something to be said for the 10mm and its wide variety of loadings.

You can get several different projectile designs with varying power levels for everything from defense against humans and to loads powerful enough to take down a bear.

Grizzly bear among yellow flowers
Something so deadly shouldn’t be so cute.

These Glocks are arguably the most versatile of the Glock pattern pistols.

The Glock 29 offers you a subcompact hand cannon, and the Glock 20 delivers full-size potential. You can get a little bit of everything with either of these guns.

Best Multi-Caliber Compact
454
at Kygunco

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

6. Savage Arms/Stevens 301 Turkey

The Savage/Stevens 301 Turkey is a single-barreled shotgun available in the most popular shotgun calibers.

For the best multicaliber option, you’ll need the 12-gauge model. I chose the Turkey variant specifically because it’s one of the rare single-shot shotguns that’s optics ready.

Savage 301 Turkey
A pair of Savage 301 Turkey shotguns. (Photo: Outdoorhub)

How exactly is a single-shot turkey gun multi-caliber? Well, it’s not all by itself. You’ll need some Short Lane adapters.

These inserts allow you to convert your shotgun to various calibers, including other shotgun calibers like .410 and 20 gauge. On top of that, the Bug Out and Pathfinder series offer five and 8-inch rifled inserts, respectively.

These caliber sleeves allow you to shoot .22 LR, 9mm, .38 Special, .45 ACP, .45 Colt, and more in your shotgun. This takes any already flexible platform and makes it even more versatile.

Best Multi-Caliber Shotgun
191
at Kygunco

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

The Savage 301 Turkey is a robust and reliable shotgun, so it was an easy pick. Top off the rail with something like the Meprolight Foresight, and you can have multiple zeroes for each caliber conversion.

579
at Amazon

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

While I’d love to see a .300 Blackout option for the 8-inch inserts, the current options for inserts are plenty diverse. You can do just about anything with the right adapter and a single-shot shotgun.

6. AR-15

Of course, the AR-15 had to make the list. Like the 1911 and Glock, the AR-15 is immensely popular and inherently modular.

EndoMag tested uppers
The AR-15 is ubiquitous, modular, and universal. It is America’s rifle.

Users can convert it to various calibers in multiple ways, including changing the barrel, dropping in a conversion kit, or swapping uppers.

Even removing and changing the barrel isn’t that difficult, but the easiest means is to just switch the upper. There is a reason most AR lower receivers say multi-cal.

646
at Palmetto State Armory

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

You can change a standard 5.56 to .300 Blackout, .224 Valkyrie, 6.5 Grendel, 6.8 SPC, .458 SOCOM, .50 Beowulf, and so many more by simply changing out the upper and maybe the buffer.

sig P320 AR and P320 mags
An AR-15 converted to 9mm with an adapter kit to accept Sig P320 magazines.

A 5.56 rifle can also be converted to numerous pistol calibers with an upper and buffer swap. The user then needs to find something like the Endo Mag or an insert from Matador Arms to convert the magazine well to use handgun magazines.

If you want a rimfire rifle, you can swap uppers, but the CMMG bolt system is an easier method.

This drop-in bolt and magazine system allows you to shoot .22 LR from your standard AR-15. Your zero may shift a bit, but it’s surprisingly reliable and easy to use.

Available Coupons

Heck, I even own a .410 upper for one of my ARs.

Have you ever heard of .277 Wolverine or 25-45 Sharps? Well, you can get an AR in those. The number of calibers the AR can accept is stunning — it’s only beaten by one gun.

7. Thompson Center Encore Series

The Thompson Center Encore Series of rifles and pistols are single-shot firearms designed for quick and easy caliber conversions.

Shooters can easily remove the barrel, replace it with another, and instantly convert it to a new caliber.

An Encore shown with three barrels, including a muzzleloader barrel on the bottom. Note the scope stays attached to the barrels to maintain zero. (Photo: Rifleshootermag)

What caliber do you want?

Want to convert your .308 to a 12-gauge? Well, you can. Want to shoot .500 S&W one day and .243 the next? Swap barrels and do it.

If there is a caliber, chances are there is an Encore barrel for it.

The Thompson Center Encore series is compatible with all Encore and Pro Hunter barrels. Shooters can even change the very nature of their guns by turning a rifle into a shotgun or a muzzleloader.

Aftermarket companies even produce more barrels, and companies like match Grade Machine produce some oddball calibers you won’t see anywhere else. Barrel swaps are easy, and the sights are attached to the barrels, so zero is held when detached.

699
at Gunprime

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

The real downside is the price of the barrels. They aren’t cheap by any means, but there are a mind-boggling amount of calibers available. With that in mind, the Encore series takes the top spot.

Final Thoughts

A gun that can shoot just one caliber can be boring. Being able to quickly and efficiently shoot a variety of calibers can be a huge benefit and is a great selling point to some.

Sometimes more is better.

There are other great multi-caliber capable guns out there, these are just a few that I like.

What’s your favorite multi-caliber weapon? Do you have any experience with any of the guns on the list? Let us know in the comments below. Not sure what calibers to look for? Check out our guides on Handgun Calibers and Rifle Calibers.

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6 Leave a Reply

  • Commenter Avatar
    Dano

    I'm curious as to why you don't include the 25 acp and the 32 ACP in your bullet line up? Both are historical cartridges and still popular today.

    September 22, 2022 3:38 pm
  • Commenter Avatar
    Dano

    My two-gun survival mode consists of a 992 Taurus Tracker with two 9 round cylinders in 22LR and 22 Mag in stainless steel. This revolver would also handle 22 Long and short. My rifle is a single shot Rossi Breztech break open 308 win. with a mounted 4x9 scope. I also have a 9 round leather cartridge holder strapped to the stock for 308. The second barrel that came with it is a 12 gauge. This firearm is a basic copy of the H&R Handi-rifle no longer produced. The rifle breaks down and stores in a case and holds both barrels. The Taurus Tracker is one of my favorites. It's heavy and the 22 magnum is a great round. The pistol is so well made it will last for a very long time. A shotgun and a 22 are a must. And with the single barrel shotgun the barrel inserts just expand the possibilities for ammo.

    September 22, 2022 3:35 pm
  • Commenter Avatar
    Rusty

    Rock Island also has the Rock Ultra that shoots .22TCM (2000fps. round) and 9mm.

    September 21, 2022 11:21 am
  • Commenter Avatar
    SL

    I can’t believe you left out Wyndham Weaponry’s innovative caliber changing AR-15 platform and Daniel Defense’s Delta 5.

    September 20, 2022 8:40 pm
  • Commenter Avatar
    bgeiger@cfl.rr.com

    I love the article, but I think you missed the mosty obvious, cheapest and most versitile multi-caliber handgun! The Glock 23 is a 40 caliber platform, but very easily converts to 9 mm and 357 sig with a simple barrel exchange and a magazine change for 9mm, but can use the same magazines for 357 sig! For well under $1000, you can have 3 fine Glock handguns in one!

    September 20, 2022 5:21 pm
    • Commenter Avatar
      James A

      I would even go a bit further and say the Glock 27/33 is the ultimate transformer with the use of X-grips and 23/22 (and 19/17 or 32/31) mags. The 27 can use the compact length slide from a 32 (357sig) and 23 (40 S&W) with the current 9round mags. It can easily take the barrel from a 357Sig in a 40S&W slide and vice versa. With an Xgrip and a compact sized mag, it can mimic the grip size of a compact sized model with the compact or subcompact slides. Swap the slide to a 26 or 19 upper and use 9mm mags, and you have yourself a compact or subcompact in 9mm, or even just use a 40S&W to 9mm conversion barrel. Track down one of Brownell's 19L slides and a Gen 5 17 barrel, and the Xgrip for 17mags with now you have the equivalent of the Glock 17. You technically can use a Gen 5 Glock 34 barrel in the slide as well. I personally have not tried the 19L slide (or the 33 slide) but I own the 19, 23, 26, 27 and 32 and can confirm all other configurations. I know you can't use a regular 17 slide on the subcompact due to the slide stop cuts, but iirc Brownell's 19L is cut like a 19 slide. So that's 3 calibers across 2 different sizes, but up to a 3rd and 4th size with a Gen 5 17 and 34 barrel.

      September 21, 2022 11:55 pm
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