JP Enterprises Polished stainless LMOS carrier Silver JPBC-3 SP. These Bolt Carrier Groups from the experts at JP Enterprises weight 6.75 ounces with the key installed. They are not meant for use in .308 AR-type rifles but are ideally meant for use with small-frame .223. For sturdy construction and the toughest materials trust the JP Enterprises Polished Stainless LMOS Carrier. Specifications for JP Enterprises Polished Stainless LMOS Carrier: Manufacturer: JP Enterprises Finish: Silver Caliber: .223 Remington Features of JP Enterprises Polished Stainless LMOS Carrier: Polished stainless LMOS carrier (without buffer) Reliable materials Superior construction Package Contents: JP Enterprises Polished Stainless LMOS Carrier JP Enterprises JPBC-3 SP: Polished stainless LMOS carrier Silver