The CMMG AR-15 Cam Pin (brand part no. 55BA46C) is a genuine replacement part for the bolt carrier group on an AR-15 platform rifle. CMMG builds it to mil-spec dimensions, so it drops into a standard AR-15 bolt carrier group in place of a worn or lost factory cam pin. The cam pin rides in the bolt carrier’s cam pin hole and rotates the bolt to lock and unlock it from the barrel extension during the firing cycle, making it one of the small parts that keeps the whole action running.

Key Specifications

• Built to mil-spec AR-15 bolt carrier group dimensions.
• Functions to rotate and lock the bolt into the barrel extension during cycling.
• Weighs approximately 0.03 pounds, consistent with a small precision-machined part.

Frequently Asked Questions

What does a cam pin do in an AR-15 bolt carrier group? It rides in the bolt carrier and rotates the bolt to lock and unlock it from the barrel extension as the action cycles.

Is this a mil-spec part? Yes, it’s built to mil-spec AR-15 bolt carrier group dimensions.

Buy the CMMG AR-15 Cam Pin

Keep a spare cam pin on hand for your AR-15 bolt carrier group, since it’s one of the small parts that can sideline a rifle if it wears out or goes missing at the range. Shop it in our AR-15 parts selection, and our Lubbock, Texas team will get it shipped quickly.