AR-15 Bolt Carrier Groups (BCGs) & Bolts

AR-15 BCGs and Bolts

Shop AR-15 bolt carrier groups and bolts for replacement, maintenance and caliber-specific AR configurations. Browse complete AR-15 BCGs, replacement bolts and compatible bolt components in multiple calibers, materials and finishes. From common 5.56/.223 and .300 Blackout configurations to 6.5 Grendel, 6mm ARC, 7.62x39 and other AR-15 cartridges, Moriarti makes it easy to compare the correct bolt and carrier configuration for your platform.

Are all AR-15 bolt carrier groups compatible with every AR-15 caliber?

No. While several AR-15 cartridges can share the same bolt face and carrier configuration, others require a caliber-specific bolt or BCG. For example, 5.56 NATO and .300 Blackout commonly use the same bolt-face pattern, while cartridges such as 6.5 Grendel and 7.62x39 require different bolt configurations. Always match the bolt or BCG to the barrel and caliber specifications.