DealThe Bolt is shot peened and manufactured out of 9310 Steel with a 4140 Billet Extractor. The 8620 Carrier is the more common DPMS pattern. The 4140 Gas Key is Hardened to USGI Specifications and fastened to the carrier using Grade 8 Hardware and then properly staked. from AIM Surplus (Product XAIMBCG308NIBBDG) |