SOT Enhanced HMB™ 5.56 Bolt Carrier Group

Description

The cam pin hole passes clean through the bolt body, and it does so exactly where the bolt carries its highest load. The platform has lived with that since the 1950s because it is simply how the rifle was drawn. The HMB™ answers it with geometry rather than material science: the pass-through hole becomes a socket, and the cam pin that sits in it is radiused rather than square-shouldered.

Material is therefore retained at the cam pin location where a through-hole removes it. Note the wording — nothing is bulked up and nothing is oversized. The design is HM Defense’s, built under licence, and it is the actual part rather than a workshop copy of a patented geometry.

SKU: BCG-HMB-556-E

Full specifications, fitting notes and warnings: SOT Enhanced HMB™ 5.56 Bolt Carrier Group — product page.

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.