Product Description
.223/5.56 NATO caliber; Black Nitride coating; Precision manufactured and individually inspected to ensure high-level performance; Strong, easy-to-clean black nitride finish; Compatible with lighter buffers to allow faster follow-up shots; Bolt: 9310 MPI tested; Individually MPI tested; Carrier: 8620 tool steel heat treated and case hardened; Gas key: tool steel - grade 8 hardened fasteners and staked properly; Cam pin: 4140 steel; Extractor: tool steel - shot peened; Lightweight - only 8.9oz