Allen Engineering OPS INC BRAKE - LONG 1/2x28 (pre drilled for p/w)

This model does not need a spacer or crush washer, shims only.  It is also pre-drilled for pin and weld.  Comes with shims.

The iconic OPS INC™ brake, recognized the world over as the primary host muzzle device for all OPS INC™ and Allen Engineering™ brake mounted suppressors. It features a single exit port, directed slightly upward to direct muzzle blast away from the ground during unsuppressed use, minimizing dust kick up. The brake acts as a sacrificial blast baffle inside the suppressor, both improving performance as well as prolonging the life of your AEM5 or other suppressor. The OPS INC™ brake helps direct gasses back into the reflex section of the suppressor better than a flash hider and is a better choice for applications where you will shoot unsuppressed rarely, if ever.

Originally, all the brakes were the long variant. These required a small number of shims to time the brake correctly. Unique among suppressors however, alignment and retention of an OPS INC™ or Allen Engineering™ suppressor is achieved by the tapered collar mounted on the barrel, which means this is the only suppressor mount that can be installed with a crush washer if desired. Use of a crush washer was originally done by request of DoD, notably in the 12th Model (AEM5) suppressor on MK12 SPR. For a clone correct Mk12, choose the short 5.56 brake. The short brake is provided with a 0.135″ spacer in case you decide to use shims instead of a crush washer.