This CMMG Bolt Catch (CMMG part no. 55CA56D) is a replacement bolt catch built for standard AR-15 pattern lowers.

Key Specifications

• Built for AR-15 pattern lowers.
• Functions as the bolt catch that locks the bolt open on an empty magazine.
• Sold individually as a single replacement part, not bundled as part of a multi-piece kit.
• A commonly stocked spare/replacement part for armorers, gunsmiths, and home builders performing lower parts kit (LPK) installation or repair.
• Classified as a firearm part/accessory, not a regulated firearm itself — no FFL transfer required to purchase.

Frequently Asked Questions

What platform does this bolt catch fit? This bolt catch is built for standard AR-15 pattern lowers.

What does a bolt catch do? It locks the bolt carrier group open to the rear when the magazine runs dry, and releases it when pressed to chamber a fresh round.

Buy the CMMG AR-15 Bolt Catch

Order the CMMG AR-15 Bolt Catch today for fast, insured shipping from a Lubbock, TX gun shop. Browse more CMMG parts in our Small AR15 Parts category.