Ares Armor “EFFIN-A” 5.56mm Compensator

    Ares Armor has developed a tunable compensator for 5.56mm weapons with 1/2-28 muzzle threads, which they are calling the “EFFIN-A.”

    Ares Armor EFFIN-A Comp

    Jesse of Predator Intel describes the device:

    This is the first Compensator that can be both stacked and tuned to
    custom fit each rifle and the its gas dispersal. The EFFIN-A features
    4 rows and 7 columns and 4 rows of ports that can be either opened or
    closed off with of set screws. Threading is cut short eliminate the
    possibility of a screw entering the chamber. This also bottoms out the
    screw making sure you have a tight fit and withstand the pressure of
    the gas forcing it out. You can also stack the Compensator allowing
    for other options.

    This Compensator combats muzzle climb in two ways; The EFFIN-A
    Compensator’s timed and tunable exit ports act as an outside force
    that returns the weapon to a “position of rest” by directly countering
    the force of the round being fired in relation to the standard
    shooter’s contact points on the weapon. This Compensator is also
    designed to directly increase the weapons moment of inertia by
    accurately counter balancing the mass of the front of the weapon in
    relation to the force of motion created by the original force.

    Due to the amount of time and money we spent on researching the amount
    of pressure released during the act of firing a round and adjusting
    the Compensator’s balance to correspond to it we will not be releasing
    the exact weight until after the pre-order is finished and products
    have already shipped. Note: testing was conducting with two types of
    ammunition, Matchgrade and GreenTips. The general weight is between 4
    and 5 ounces.

    The Compensator has an outer diameter of 1″ and is 1.95″ inches in
    length when the cap is removed. You have the choice of selecting the
    EFFIN-A Compensator in Black or Stainless Steel depending on which
    aesthetic appeals to you or best matches your weapon.

    WARNING If you attempt to modify or use these devices in any way
    attempting to create baffles for a suppressor, it will instantly void
    our warranty and possibly land you in jail. PLEASE OBEY THE LAW!

    We do not recommend stacking more than two of these on top of each
    other. If you do so, you do it at your own risk and it will also void
    the warranty.

    A promo video showing various people using AR-15s equipped with the device has been released; this is the “clean” version, which has loud music playing in order to block out profanity.

    EFFIN-A Compensator

    Although threads are not shown in the 3D rendering below, the cap is screwed on with the same 1/2-28 threads. It is thus possible to attach another EFFIN-A Comp to the front of the device. This exploded view shows how the device is “tunable.”

    Ares Armor EFFIN-A Comp Exploded View

    Tunable compensators have been made before, but I do not believe that I have ever seen a compensator threaded to accept another compensator (or other muzzle device).

    The “EFFIN-A” is available for pre-order at, with a projected availability date of September 1st. It is available in black and stainless. The pre-order price is $90.99.

    Andrew Tuohy

    Andrew Tuohy was a Navy Corpsman with the 5th Marine Regiment. He makes a living by producing written and visual content within the firearm industry, and he also teaches carbine courses. He prefers elegant weapons for a more civilized age, and regularly posts at Vuurwapen Blog.