Blank Firing Attachment (BFA), M15A2/M23

Blank Firing Attachment (BFA), M15A2/M23. The BFA (Figure A-4) attaches to the muzzle of the M16-/M4-series weapons. It is designed to keep sufficient gas in the barrel of the weapon to allow semiautomatic, automatic, or burst firing with blank ammunition (M200 only). After firing 50 rounds, the attachment should be checked for a tight fit. Continuous blank firing results in a carbon buildup in the bore, gas tube, and carrier key. When this occurs, the cleaning procedures in TM 9-1005-249-10 or TM 9-1005-249-34 should be followed. The M15A2 is painted red and is used on the M16-series weapons. The M23 is painted yellow and is used on the M4-series weapons. For identification, the Yellow M23 is stamped "M4 Carbine Only."