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AR-15 .450 Bushmaster 7.5" Pistol Build Kit / Linear Comp / Classic. This kit includes everything you need to complete your .450 pistol project except the lower receiver. It is based on AR-15 platform and features 4150 CMV barrel, M16 cut BCG, milspec lower parts and 4.3 heavy buffer. Barre..AR-15 .450 Bushmaster 7.5" Pistol Build Kit / Linear Comp / Classic...$499.95$749.95