Spikes Tactical SAKB0100 Barking Spider2 Muzzle Brake Black Nitride 4140 Chromoly Steel with 1/2"-28 tpi Threads, 3.75" OAL & 1.40" Diameter for 5.56x45mm NATO $121.46
Spikes Tactical SBV1065 R2 Muzzle Brake Black Nitride 416R Stainless Steel with 1/2"-28 tpi Threads for 5.56x45mm NATO $52.20