Colt USGI A2 5.56x45 Flashhider for AR-15
The 5.56x45 Colt USGI A2 Flashhider a.k.a. Bird Cage is designed for mounting on 5.56x45 weapons built on AR-15 system. However, it can be installed on other weapons of the same caliber, provided that barrel has the same threading for muzzle devices. A service muzzle device for M4A1.