This is a Spike's Tactical Flash Hider chambered in 556NATO, model SAFH510.
The A2 bird cage flash suppressor is the standard muzzle device of the U.S. Armed Forces and is found on most M4/M16 rifles as well as many AR-15 rifles.
Features:
1/2X28 thread pitch
Includes Mil-spec crush washer
Heavy phosphate finish
