This 458 Socom 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 enhanced 9310 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:
We believe in quality and reliability when choosing a bolt carrier group, so we only sell fully assembled BCGs from Toolcraft. We don’t add any inferior plating to raw carriers or use random bolts to complete our setups. 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!