The CMMG Receiver End Plate Mk4 (CMMG part no. 55CA9DD) is a direct-fit replacement end plate built for the Mk4 platform’s buffer system. It sits at the rear of the lower receiver, anchoring the buffer tube and providing a mounting point for a QD sling swivel on compatible builds. CMMG builds this end plate to factory specifications for a straightforward drop-in replacement or upgrade.

Key Specifications

• Built specifically for the CMMG Mk4 platform’s buffer system.
• Anchors the buffer tube at the rear of the lower receiver.

Frequently Asked Questions

What platform does this end plate fit? The CMMG Mk4.

What does the receiver end plate do? It anchors the buffer tube at the rear of the lower receiver as part of the buffer system.

Buy the CMMG Mk4 Receiver End Plate

Whether you’re replacing a worn end plate or building out a Mk4 buffer system, this CMMG factory-spec part is a direct fit. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and browse our full AR buffer system selection.