100% HPT & MPI
Sprinco 5-Coil Heavy Extractor Spring
Our bolts are made from Carpenter 158® Steel. Our bolts are 100% high pressure tested and magnetic particle inspected. Each bolt is shot peened and comes with a Sprinco 5-Coil heavy extractor spring and black spring insert.
Our M16 profile Bolt Carriers are machined to USGI specifications. Our M16/M4 carriers include proper Mil-Spec gas keys. Our Gas Key is chrome lined and heat treated per GI specifications. The Gas Key is secured to the carrier via USGI domestic manufactured Grade 8 fasteners and properly staked per Military Specifications. These properly hardened parts insure a strong staking and proper gas system functioning.
Each bolt and carrier assembly is treated with durable NP3 plating which creates a permanently lubricious surface which eliminates the need for grease, oil or any wet lubrication.