The QD Blast Shield was designed to offer significant concussion reduction for the end user and other team members operating in the immediate vicinity. Often team members in CQB environments experience concussion from muzzle blast that is not only deafeningly loud” but also can cause prolonged headaches that can last for days afterwards. Especially effective on short barrels” the unique design of the QD Blast Shield directs concussive force forward allowing an end user to rapidly reconfigure muzzle device function. The body is fluted in the same way as Griffin QD suppressors” increasing strength to weight ratio for added geometrical strength” while increasing surface area for faster cooling. The QD mechanism is fast” positive” and free of wear prone geometry commonly found in ratcheting devices. The QD Blast Shield also comes with a shim set and over travel stop to refit your A2 compensator for optimal use. The Griffin QD Blast Shield is compatible with their line of Gate-LOK mounts in 7.62 and 5.56mm” including the Gate-LOK Flash Comp (5.56mm)” Gate-LOK Hammer Comp (5.56mm)” Gate-LOK Stealth Flash Hider (5.56)” and Gate-LOK Flash Comp .30cal (7.62mm). Discontinued products the QD Blast Shield is compatible with: M4SD Muzzle Brake” Linear Comp” Compensating Flash Hider” & Tactical Compensator. Also designed to fit the USGI A2 government contract compliant muzzle devices. Griffin cannot guarantee fitment with an A2 style compensator due to the broad tolerance range of both import and domestic devices from various brands. For guaranteed fitment” Griffin recommend the purchase of a Griffin mount.