Ares Armor makes the EFFIN-A compensator, a design that allows the user to adjust how and where the gasses are vented from the end of their barrel. It allows the end user to precisely tune how the compensator mitigates the recoil from your gun based on testing your specific setup. Previously it had been available for the 5.56x45mm NATO cartridge and related barrels, but they’ve just announced through Predator Armament that they have released thirty cal versions for both the AK-47 and the AR-10 rifle platforms. Oh and it also works with 300 AAC Blackout, but I have no idea why you would do that. What really interests me is the adjustability of this compensator, allowing the user to try out all sorts of combinations of direction and size — it appeals to my inner hacker. Needless to say I’ve asked for one to test and we’ll get back to you shortly about how well it works.