AMTAC’s Over the Barrel Suppressors

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In all the hub-ub of SHOT Show, the small company AMTAC slipped through the cracks with an over the barrel line of suppressors. AMTAC’s line of suppresors, minus only a single model (the “SBR”) are designed to reduce the overall length of a weapon system by moving some suppressor volume to behind the threads (or “over the barrel”).

While not the first company to offer an over the barrel model in recent memory (OSS’ suppressor systems beat them on timing to the market) its nonetheless an effective way to reduce the bulk of a suppressed weapons system compared to thread-forward cans. Specifically, it keeps weight farther to the rear and reduces the overall weapon’s length. In the case of AMTAC, their suppressors are generally only 3.7″ longer than the base barrel.

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Interestingly, AMTAC uses a single-piece baffle, fully removable for cleaning or servicing. With their lifetime warranty, the baffle (which serves as the thread adapter as well) can be quickly replaced without having to send the can off for servicing.

AMTAC offers three over-barrel designs. The flagship CQB model is designed for barrels .76″ in OD or smaller and the CQBm is the same, just for longer barrels. AMTAC claims the architecture reduces blow-back on direct impingement weapons. Due to the over-barrel design, only certain cans will be compatible with certain weapons. For example, the CQB will not work with mid-length gas systems, as it requires nearly 6″ of free space behind the barrel.

Pricing around $875 for most of the 5.56 cans and about $1000 for the 7.62 and larger cans. You can check them out at their website. 



Nathan S.

One of TFB’s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSR’s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

Nathan can be reached at Nathan.S@TheFirearmBlog.com

The above post is my opinion and does not reflect the views of any company or organization.


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  • tts

    This makes so much sense I have to wonder why no one has tried to do something similar before? Are there any inherent issues with this sort of supressor?

    Only thing I can maybe think of is excess heat being held next to the barrel warming it up faster with each shot. But that is just a maybe.

    Too bad about that price either which way though. *sigh*

    • Drew Coleman

      Probably cost to build/design, and the issue with only working on carbine length gas sytems at this point.

    • Theo Braunohler

      It’s called a reflex silencer and the design is ancient. Nobody makes them anymore because they are inferior in every way, since you can now buy 5″ cans, etc., with the same dB reduction, for less money. The only one I can even think of that is still in production is the Griffin RSTA, though I’m sure there are a few others.

      • Budogunner

        This. Reflex cans are fairly old-school at this point. They aren’t as efficient as modern designs. The folks established in the US suppressor industry are no slouches. They’d have run with reflex designs before now if it gave them a more competitive edge in the market.

        As it is, I ‘think’ reflex designs are slightly more common in Europe.

        • tts

          Didn’t know that thanks guys.

      • Mack

        Allen Engineering still have theirs in production as well.

        • Mike N.

          Right, they were the OEM for Ops Inc. I have an AEM5 (what used to be sold as the Ops Inc. 12th model, with only minor cosmetic differences), and it is an excellent suppressor.

          • mig1nc

            Indeed, I am an Ops Inc owner and am very happy with the lack of length it takes up and the sound performance. Not to mention the two-piece mount tensions the barrel for improved harmonics.

      • JumpIf NotZero

        Griffin makes a new one, but yes, mostly pointless.

        There are a couple niche uses and can be done well. If it can be done without a second wall that directly lays over the barrel (KAC M110?) and not making extra useless weight, it’s not a bad idea ascetically. Or in applications with that might benefit from high volume.

        They’re pretty much dead tho.

      • The other way to do it is to thin the barrel and make the threads further down so it covers a certain amount of the barrel and reduces overall length.

    • iksnilol

      Fantastic in the rest of the world, kinda crappy if you want to follow the laws in the US.

      Since these cans whilst better (not this one specifically, goodness gracious look at them baffles) aren’t as flexible. And in the US nobody cares if their can extends 20-25 cm in front of the muzzle if it means they can use it on all of their guns.

      For us in Europe with no suppressor laws those flexible cans are silly since I can buy a decent reflex can for each of my guns.

  • C. Her

    Just my luck! My SilencerCo Omega can is already 4 month’s deep in NFA jail.

    • BillC

      Don’t be dumb. That Omega was what, just over $800 for a .30 cal can that can be run on 5/8″x24 and 1/2″x28 thread pitch, quick-attack adapters, different endcaps including a brake, be used on multiple barrel lengths regardless of the length of your gas system, actually be used on different calibers easier, and not worry about interference with anything that’s behind the barrel. Oh, the Omega with the ASR and brake endcap weighs at 14.7oz, which is less than this “sniper” version.

      • JumpIf NotZero

        ARG! Toyota just released a new Corolla and here I am stuck with this BMW.

        ಥ_ಥ

        • BillC

          Haha, right.

        • iksnilol

          To be fair, BMWs are pretty crappy. Not as crappy as Corvettes but at least those work.

      • C. Her

        Sorry Buttercup.

  • Hensley Beuron Garlington

    Okay TFB, I want to see a side by side comparison of these two brands’ cans.
    I want to know which one actually protrudes the least past the end of the barrel, which is quieter, and which has less gas blow back and bolt velocity.
    Be nice to not just see the most comparable models against one another, but also a general average of which which is the best in these categories.

    I like the OSS better, working with Battlefield Vegas, I think they have the best testing environment. But this new challenger might have a chance. Clear the air please.

    • JumpIf NotZero

      OSS is absolutely the better part compared to this… And I don’t even like the OSS. I have no doubt the OSS is louder than any SiCo or Rugged or Surefire or DeadAir or AAC rifle can. But also no doubt that the OSS is quieter than this.

      The OSS does have a nice feature that they have similar blowback with or without the SRM “module”…. Yet… No one has presented a scenario why I would be shooting without that part in place. When am I going to take the 4” suppressor part off and “go loud”?

      So if I’m going to always shoot suppressed (and I am) I’m also going to just tune the gun for the can. If you haven’t realized that the can is PART OF THE WEAPON yet, I don’t know, just a filthy casual I guess? This is a fairly quick lesson to learn.

      Dedicated can, gun tuned for it, no hype, no gimmicks.

      • MikeSmith13807

        I think that feature of the OSS is really cool. You can get substantial suppression with almost no length increase–even if not hearing safe, it’s still a while lot better than no suppression, or dealing with the issues of shortening the barrel.

    • TCBA_Joe

      I have a feeling OPS INC would be an even better alternative to either.

      • Hensley Beuron Garlington

        I always liked the look of their M4-S! I forgot about those guys. Thanks for mentioning them. I don’t know if they qualify for the above claims though, but still I’d like to see more about their products.

  • JumpIf NotZero

    That core is a such HUGE NEVER. Anyone with any amount of silencer design knowledge will flat out tell you that making the bore into a tube with flat washers is probably one of the worst designs you could try. Couple that as a reflex… And of course it’s got a positive PR article here.

    I wish them luck because really.

    • Budogunner

      That baffle stack is… ‘special’. O.o

    • G0rdon_Fr33man

      Been using telescopic suppressors over here for a long long time for hunting. They work just fine and give a better balance and an increased internal volume. HOWEVER, they are Sh*ityy designs if supposed to handle high rates of fire. “Tactical” reflex suppressors don´t exist for a reason, and being “first” in this regard just shows that anyone can make a tacticool suppressor in the US these days, as long as you have a decent marketing department.

  • G0rdon_Fr33man

    European made reflex suppressors aren´t meant for high volume shooting. They are great for hunting, with only a few shots fired and a lot of carrying. A reflex design made to handle high rates of fire would also be excessively heavy. Which is why they really don´t exist. It is simply not a good idea for any sort of “tactical” applications. Not sure the rear bushing touching the barrel is a good idea either.