Forward Controls Design – 1210KM Muzzle Brake – KeyMo Compatible – (5/8×24)

1210KM (5/8 x 24) is FCD’s latest offering in the Dead Air sound suppressor mounts line. Threaded for 5/8 x 24, 1210KM is a Keymo compatible brake, compatible with all Dead Air 30 caliber sound suppressors.

We don’t like brakes for ARs, they’re loud and obnoxious. While a brake will reduce felt recoil, it has unjustifiable compromises in increased concussion, noise and flash signature, one also wouldn’t want to use a brake from inside a vehicle or indoors, these are trade offs a flash suppressor doesn’t have. That said, a brake for a sound suppressor does have its use as a sacrificial first baffle to increase the longevity of a sound suppressor. For this reason, there won’t be a 1215 or 1210 (sans the Dead Air Keymo mount interface), 1215 design will solely reside on 1215KM (1/2×28) and 1210KM (5/8×24).

1210KM is a single chamber brake, with a baffle like chamber forward of the ports (dear ATF, this does nothing to reduce the decibel). The tines on top and bottom that connect the Keymo mount to the front chamber are of symmetrical, we think a smaller/thinner top tine to force more gas upward is unnecessary.

Let’s do away with ambiguities and insinuations as to what it is and what it does, 1210KM is a brake, it’ll be loud, and its concussion will kick up dust visible from the next county if you shoot it from a prone position without a sound suppressor. 1210KM is meant to be used with a Dead Air sound suppressor attached.

1210KM is designed to have less concussion than most brakes. In terms of felt recoil reduction, most brakes are similar in performance. In the old days, some tank guns brakes are nothing more elaborate than a tube mounted perpendicular to the bore forming a T shape, it doesn’t take much to make a brake that works. If one is to look at old tank gun brakes, he will soon realize these tank gun brakes and most muzzle brakes for small arms today bear surprising resemblances and design. To make a brake less offensive is far more difficult. In our experience, Knight’s Armament’s MAM brake is probably the best in that category, it’s also very costly. 1210KM follows our design philosophy, it’s a simple and effective brake. It does what it’s designed to do, and does so without making unsubstantiated claims.

We tested the 1210KM against a host of brakes and flash suppressors. Flash suppressors are the least concussive. The one we know to be the most offensive was as loud, concussive and obnoxious as ever. Nothing we don’t already know.

Even though the Mk12 brake is the 1210KM’s inspiration, it is still an FCD design, we did not use most of the Mk12 brake’s features. The ports are not angled like the Mk12 brake. The flat sides of the port don’t direct gas back to the user, or bystanders behind the shooter. 1210KM’s design goals were not only met, but exceeded.

* Machined in 4140, heat treated and black nitrided.
* Length: 2.402″
* Weight: 3.46 oz.
* Drilled for pinning
* Recommended torque: 30 ft lbs +/- 5

NOTE: 1215KM is long enough to bring a 14.5″ barrel to over 16.1″ when pinned and welded, but not enough to do so on a 13.7″ or 13.9″.