5.56 NATO & 300 BLACKOUT BOLT CARRIER GROUP Bolt (May or may not have HPI MPI SP on bolt) Machined from Carpenter Technology No. 158 alloy. Heat treated Shot peened per ASTM B851/SAE AMS2430S Individually High Pressure Tested (test... MSRP: $154.95 Was: Now: $124.95 Add to Cart
