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EFFIN A Compensator MKII

  • EFFIN A Compensator MKII
  • EFFIN A Comp MKII 5.56
  • EFFIN A MK II 5.56
Your Price:
$80.00 (You save $19.99)
In Stock
Calculated at checkout

Product Description

Ares Armor has redesigned the EFFIN-A Compensator with the MKII model coming in at half the weight and a more minimalist tuning system. There are now 21 ports for customizing the comp to your individual rifle and round. Set screws will bottom out for a secure fit and clear chamber.

The EFFIN-A MKII Comp 5.56 weighs in at just 2.5 ounces and now has a one piece design. Currently the MKII version is only available for rifles chambered in 5.56/.223 as well as a version for .308 and .300 caliber rifles. Both versions are available in Black. 


  • Black
Additional Info:
  • AR15 (5.56/.223) 1/2X28
  • AR10 (.308,.300 BLK) Thread: 5/8X24
  • AK-47 (7.62x39) Thread: 14X1 LH
  • Comes with Allen Key for tuning
  • Crush washers and set screws included

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Product Reviews

Showing reviews 1-10 of 13 | Next

  1. Excellent product. 4 Star Review

    Posted by on 26th Oct 2014

    The product itself works very well. About 20 minutes of tinkering largely removed the muzzle flip on my SR556, which was very reasonable. My only complaint is that two of the set screws were absolute duds. They would not insert into any of the ports and eventually had to be thrown away. This isn't a deal breaker by any means since there are many open ports, but it's worth noting.

  2. great muzzle device. 4 Star Review

    Posted by on 17th Sep 2014

    I gave it four stars only because the finish came off while installing it. But if you care about that you might want to use caution while installing it. My rifle is beat up and scratched from use so it basically matches from the start. After I adjusted the device I noticed a big difference in both my rifle and personal performance. I have an m4 three round burst and it keeps me on target very well. So civilian semi will do extremely well with this device. Stop thinking and buy it its worth every red cent spent on it.

  3. Awesome! 5 Star Review

    Posted by on 23rd Jun 2014

    I was very pleased with the performance of this product. It reduced recoil and reduced muzzle movement by 95%. Took about 20 shots to tune it up and haven't touched it since. Awesome product and worth every penny.

  4. It effin works! 5 Star Review

    Posted by on 9th May 2014

    Really works. Notice the difference right away with just one plug screw. Ended with 4 screws config. Thanks your product is effin awesome

  5. Effin A 5 Star Review

    Posted by on 11th Apr 2014

    Excellent for the price, easily tuned, might be my imagination but seems to quiet report as well.

  6. Everyone's Favorite BAFTE Inspected Manufacturer's aptly named Effin-A 5 Star Review

    Posted by on 11th Apr 2014

    I am a huge fan of Ares Armor products, My AR is mainly comprised of Ares parts. As anyone who has purchased any of their products knows they pride themselves on excellence. My BCG is Ares, 80% Lower also Ares... it only made sense to go with a highly reviewed and innovative product. I know this does not affect the quality, but the packaging was creative... the MD came in a prescription bottle with a humorous instructions usage warning.

    And as for Predator Armaments role in supplying me the part, I could not be happier, excellent communication and incredibly fast shipping. I am definitely a satisfied customer.

  7. You get more than the competition can offer at this price point 5 Star Review

    Posted by on 10th Apr 2014

    Take the time to tune it properly and you'll have zero muzzle flip/movement. Allows you to match the compensator to any rifle/ammo configuration. Excellent product. Plus one for being a product of a veteran owned company.

  8. Effin-A Mk II review 4 Star Review

    Posted by on 10th Apr 2014

    Initial tests were great. I think I can tweak it out a little more but that will have to wait until the next visit to the range.

    After putting 4 set screws into the bottom, I was able to hit the 100m target 20/20 times within 15 seconds or so. Very little rise in muzzle after tuning it. I may be able to take virtually all the rise out by changing where I have the screws placed.

    All in all, great comp!

  9. I will never buy another comp 5 Star Review

    Posted by on 14th Dec 2013

    I have been running a Mk1 for my piston AR and years and it is perfect. I bought a Mk2 to pin and weld to the front of my 5.56 AK, and it has ZERO muzzle flip. I'm about to buy another Mk2 for my lightweight AR build. I will never buy another compensator. No other muzzle device allows you to completely tune the performance for your rifle. Surefire has a model that allows you to open or close 1 hole, but it comes nowhere near the adjustability you get with an Ares.

    Also, the dudes that run Ares Armor are retired Marines and are cool as hell.

  10. this is one of the best compensator out there 5 Star Review

    Posted by on 5th Nov 2013

    Just put it on and with out any adjustments it was helping bring my muzzle down .added one screw and its perfect. Good jod guys I look forward to putting it on my hunters rifle

Showing reviews 1-10 of 13 | Next

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