Manufactured by the finest domestic Mil-Spec contractors these are among the best AR rifle bolts on the market and the same bolts used as the basis of Wilson Combat's renowned custom rifles! The bolt is precision machined from aerospace grade 9310 tool steel, shot peened for increased strength and includes a tool steel extractor and ejector, appropriate extractor spring, and is MPI (Magnetic Particle Inspected) and randomly batch HPT (High Pressure Tested). The extractor is 4140 gun quality, annealed, cold drawn steel per the Mil-Spec. The 8620 steel carrier includes a properly machined Mil-Spec gas key that is completely Nickel Boron plated for the ultimate in smooth operation and easy cleanup. It is secured to the carrier via Grade 8 fasteners and properly staked during final inspection. These precisely machined, finished and hardened parts will ensure long term proper gas system functioning and reliability. All experienced AR shooters know that the best spare parts kit for an AR-15 rifle is a spare complete bolt carrier assembly!

Features and Specifications:
Bolt material is aerospace grade 9310 steel
Polished Nickel Boron Plated
Caliber: .458 SOCOM and .450 Bushmaster
Machined Ejector and Extractor per Mil-Spec
Full Auto Carrier
MPI and HPT Tested
High hardness (Rockwell 70 C +)
Low Coefficient of Friction
Easy to Clean
No Hydrogen Embrittlement
Abrasion and Wear Resistant
Drop-in Fit

Fits:
AR-15 Upper Receivers

Note: This product is not returnable. Contact the manufacturer for warranty and assistance.