Crye Precision asked STS to design a Zombie themed gun for a charity auction (before zombies were cool), This product was designed as a joke and afterthought the very day the rifle was being driven to SHOT Show, turned out, the Muzzle Thumper is what everyone loved most!  The Muzzle Thumper reduces recoil energy transferred to the shooter. The Benign is the “Benign” version of the OG MuzzleThumper.

• 1/2-28 RH Threads
• Designed for 5.56 or smaller bores
• Comes with Crush Washer