Home / Accessory-Lowers / Bushmaster M4 BUILT LOWER RECEIVER View cart “Warrior Systems WSM15 BILLET RECEIVER SET BLK” has been added to your cart. Bushmaster M4 BUILT LOWER RECEIVER$27795 Out of stock SKU: 00-20005-BLK Category: Accessory-Lowers Product ID: 58418 Description Description Related products Sale! Franklin Armory BFSIII LIBERTAS BLR LOWER $62999 Original price was: $62999.$60460Current price is: $60460. Sale! Warrior Systems WSM15 BILLET LOWER BLACK $29900 Original price was: $29900.$22259Current price is: $22259. Sale! Wilson Combat RECEIVER SET AR-15 BILLET $48995 Original price was: $48995.$44111Current price is: $44111. Sale! Wilson Combat RECEIVER SET AR-15 FORGED $26995 Original price was: $26995.$24830Current price is: $24830.