The Foxtrot Mike Products AR-15 .45 ACP Build Kits give you a jump start on joining the trend of fun to build, fun to shoot PCCs. Foxtrot Mike Products has built up a solid reputation as a quality supplier of pistol caliber AR-15 components and these Build Kits take many of those key components and bundle them together to save you time and money. Included in the .45 ACP Build kit is a stripped, Glock magazine compatible lower receiver, a complete .45 ACP bolt, a heavy buffer, a .308 buffer spring, a thread protector, and your choice of 5", 7", or 16" .45 ACP barrel. The billet Mike-45 lower receivers are stripped down for your Mil-Spec triggers and lower part Mfg: Foxtrot Mike Products