CMMG AR-15 Buffer Retainer Parts Kit (55AFFDC)

CMMG Pistol Receiver Extension Kit (55CA65A)

CMMG AR15 Carbine Receiver Extension Kit (55CA6C7)

Angstadt Arms 9mm Buffer Kit, 5.4oz 9mm AR-15 Carbine Buffer Assembly, Carbine Buffer Spring, 9mm Buffer Spacer, Compatible with Both Glock and Colt Style Magazines, Anodized Black Finish AA09BUFKIT

BRAVO COMPANY Milspec Buffer Kit (BCM-STOCK-HARDWARE-KIT)

LBE UNLIMITED AR-15 Mil Spec Buffer Tube Kit With Buffer Tube (MILBUFKT)