LBE Unlimited AR Bolt Kit 158 Carpenter Steel Drop-In AR-15

The LBE Unlimited AR Bolt Kit is a drop-in replacement bolt assembly designed for AR-platform rifles chambered in .223 Remington, 5.56 NATO, and 300 Blackout. Built around a mil-spec bolt machined from 158 Carpenter Steel, this kit provides the core firing components needed to assemble or service an AR-15 bolt carrier group.

The bolt is finished to mil-spec dimensions for a reliable fit in standard carrier housings. The included firing pin, cam pin, and firing pin retaining pin round out the assembly, giving builders and gunsmiths all the small parts commonly replaced during a bolt service or upgrade.

Designed as a straightforward drop-in package, this kit is well suited for a fresh bolt carrier build, replacing worn components, or simply keeping spares on the bench. Offered by LBE Unlimited.