The EFFIN A Compensator now in 7.62mm

The EFFIN A Compensator is finally available in 7.62mm. It features 28 exit ports (7 columns and 4 rows), any of which can be blocked by inserting a screw. Users can selectively block ports to tune the compensator’s blast so that the rifle always returns to the same position after recoil.

The 7.62mm version is available in an AR version and an AK version. The MSRP is $91.

Steve Johnson

Founder and Dictator-In-Chief of TFB. A passionate gun owner, a shooting enthusiast and totally tacti-uncool. Favorite first date location: any gun range. Steve can be contacted here.


  • Komrad

    Very cool idea. I worry a little bit about the threads being damaged by muzzle blast/flash, but I suppose proper heat and surface treatments would negate that issue.
    Being able to selectively port like this seems like it would be extremely useful for screw on muzzle brakes. Even if you screw it on funny and it is rotated from when you last put it on and adjusted it, you’d just need to move some screws.

    any word on whether these are proprietary or standard screws and whether this will function as a flash hider as well?

    • Zermoid

      I would guess that this (as most muzzle brakes do) would make for an even greater muzzle flash, but I could be wrong.

      As to the carbon issue, a good solvent/oil (I’m thinking Kroil or PB Blaster) should clean it out with a bit of soaking time, and at worst a bottoming tap would be able to chase the threads if need be. Assuming it is a standard thread size/pitch and not something proprietary.

      • Komrad

        I was thinking that it might act as a flash hider with all the screws removed.

  • Other Steve

    Seems like a novelty to me. Like, we don’t know how to tune it, so you do it yourself.

    Once it’s blocked the right way, when would I ever change it? I’ll pass on doing the development for them. Plus I agree, those threads are going to get carbon in them pretty quick, this just seems like an internal prototype and not a release part. Maybe I’m just not getting it.

    • Tuulos

      There is no one truth for all. Depending on your stance, weapon and if you are right or left handed your muzzle might return to the original position or it might not. With this you can adjust the brake to get pretty much spot on back to the point you were aiming after each shot.

      • JDubbs

        Isn’t that the point of every compensator?

      • Tuulos

        JDubbs, while that is the result everyone hopes for, it might not happen with a standardized muzzle brake for everyone. That’s why a muzzle brake with an option for adjustment is a pretty good invention actually. Especially if one tries to compete seriously for medals.

  • Lord Cthulhu

    I’d hate to see one of these little screws become a projectile launched at the person next to you at the range…

  • Proph

    What a name… EFFIN A? As in, F’in A!

  • Lance

    Looks cut and is ten years late in 02 when Flash hiders where illegal this might have had interest but now A2 and Phantom Flash hiders are King or the AR world.

  • Jesse (Predator Armament)

    Thanks to the guys at The Firearm Blog for bringing out the new EFFIN-A Compensators. We appreciate the interest from the readers along with the questions. There are a lot of reviews out there on the EFFIN-A 556 and we are happy to say it is not a gimmick, though the sentiment can be understood at first glance. The screws are secured as bottomed out. Thousands of rounds have been ran through them to ensure this is not an issue.

    As with other aspects it needs to be customized to your needs, but proves a simple process with minimal rounds expended and instructions are provided. We think this is a positive since people can shoot differently and rifles vary. You will most likely have plenty of screws left over in the event some fall by the wayside. One reviewer even covered cleaning ports in the event addition tuning is needed for a different rifle or other aspects i.e. load

    The screws are designed to fit the ports and can be replaced if needed at minimal cost. Though the necessity has not presented itself yet. We had a lot of these questions with the 5.56 option and are excited to get the .308 and 7.62X39 options out their for customer impressions. Again, thanks for the questions.

    • noob

      If a user is happy with the way they have tuned their compensator pattern for their rifle and chosen load, is it possible to stake in the screws so they absolutely will not wiggle free?

      is it possible to use locktite or other threadlocker without it burning away?

  • Bmac

    The first time I saw these I was very impressed. So simple but so ingenious. I’m not the best shot, pistol or rifle. I want one for my ARs, HKs and my .22 pistols. I want to see what, if any improvement it gives in my .22s w/threaded barrels. It’ll be a bit before I can get one as I’ve been in the hospital for 6 months so I gotta make some “toy”‘money. This is high on my list.

  • Doesitmatter?

    Hang on, I dont get it: return to its original position? What position? Is it previous line of aim? But that is done by shooter’s eye-muscle coornination; is it not? By the way, how they plan to attach new screw into carboned-up threaded hole?

    I do not see why to bother with another crappy gadget. Why not to experiment with new operating mechanism which curbs the recoil altogether? That would be progress!

    • JMD

      It’s not about counteracting rearward recoil force, it’s about compensating muzzle rise, which happens so fast that nobody can react quickly enough to overcome it effectively. It’s not a stupid gadget, it’s just an evolution of existing compensator designs.

  • John Doe

    As the name implies, this is Effin’ Awesome.

  • D

    I like it. Considering the variations in weapons, manufacturer loaded rounds, etc, i think a tuneable compensator’s a good thing. Plus, you could switch it between weapons if you wanted or needed to for some reason, and just readjust it.

    If i was a 7.62 shooter i’d definitely look into getting one.

  • Spencer W

    I love the design and the name but I really want to see some pics of it being shot at night.

  • Mike

    WE NEED A DEAL ON TWO….so i can get my stack on. No more than 160$

  • Jeff Smith

    I keep noticing that everywhere that mentions this compensator also has explicit warnings that modifying it could constitute creating a baffle for a suppressor. Does anyone know how that is possible? I’m not asking for instructions or anything; I’m just wondering what the reasoning is behind this. How is it different from any other compensator?

    • Komrad

      I assume it has something to do with the potential for the holes to act as ports for the gas to leak into a can.

      • Cymond

        A suppressor is nothing but a tubular series of chambers. The Effin A can become a single chamber if someone puts all of the bolts in. The front end has threads so that another compensator can be daisychained on. If someone stacks a half dozen sealed Effin A-s, then they effectively have a suppressor.

    • Jeff Smith

      Thanks! I like the compensator, but I am deathly afraid of getting a product that can inadvertently become an NFA violation. I feel a little more comfortable now knowing that I would have to INTENTIONALLY modify it to do so.

  • Adam

    Effin A owner here – I have production number 9 of the first 10 ever made and have put about 900rds through it since I got it.

    The screws are not coming out; no way. They are as tight as they were when I put them in my self (bottom row, and bottom right row).

    This is a great device and Ares are all active duty or ex-mil guys. All very young too.

    I can post pics if anyone wants to see a “used” one.

  • Ian

    I personally don’t really care to bend my barrel with asymmetric compensators.

  • Mike Knox

    That’s a weird name for a product..

  • Awesome post. Will read on…