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”

The Gate-LOK Flash Comp optimally combines the functions of three traditionally separate classes of devices- Muzzle Brakes Tactical Compensators and Flash Suppressors. The Gate-LOK Flash Comp achieved a perfect 5 out of 5 in National Tactical Officers Association testing to achieve the rare coveted NTOA Gold seal of approval granted to devices which achieve perfect evaluations. Compatible with the M4SD series Gate-LOK suppressor interface. The Flash Comp provides a sacrificial baffle to increase the service life of your silencer. It is also pre drilled and 2.25 length for 14.5″ to 16″ permanently attached Non-SBR M4 carbine builds. For optimal flash reduction we recommend 14.5″ or longer barreled host weapons. Extreme durability low concussion flash and recoil reduction are the wave of the future- the Flash Comp provides an elegant solution to a complex problem. Includes shim set and over-travel stop washer (for mounting to suppressor).”