TOOLCRAFT BLACK NITRIDE BOLT CARRIER GROUP – 158 MPI
This black nitride BCG from Toolcraft is a popular choice for AR-15, M4 and M16 builds due to its mil-spec design and lifetime warranty. The bolt is made from 158 steel while the carrier is made from 8620 tool steel. It is shot-peened and magnetic particle inspected before being made available for sale and has a variety of other top-of-the-line features, including:
Mil-spec extractor spring, black extractor insert, Viton O-ring
Tool steel extractor
Shrouded firing pin
Mil-spec 4130 steel gas key attached with Grade 8 hardware and properly staked
Caliber: .223 / 5.56 / 300 Blackout
We believe in quality and reliability when choosing a bolt carrier group. Everything is assembled and inspected by Toolcraft, inspected again by our team and sold straight to the customer. Contact us if you have any questions!