Quick view Griffin Armament Griffin Armament XHP556FC Gate-LOK Flash Comp Black Nitride 17-4 Stainless Steel with 1/2"-28 tpi Threads, 2.21" OAL & .863" Diameter for 5.56x45mm NATO M4SD, M4SDK, M4SD2 & 30SD Series Silencers $99.95 $95.00 The m4sd flash comp optimally combines the functions of three traditionally separate classes of devices- muzzle brakes, tactical compensators, and flash suppressors.Compatible with the m4sd series gate-lok suppressor interface the flash comp provides a... Compare Add to Cart