The CMMG Buffer Assembly for the AR15 rifle (CMMG part no. 55CA9A7) is the rifle buffer CMMG builds for mil-spec AR15 rifles. It is made to work with any mil-spec AR15 rifle action spring and an A1 buffer tube, and CMMG states that it meets or exceeds mil-spec. The buffer is a simple wear and tuning part, so it is an easy replacement when you are refreshing a rifle or finishing a lower build. CMMG lists a separate carbine buffer assembly, so this is the one to choose for the rifle setup.

Key Specifications

• The part is a rifle buffer assembly for the AR15, the weight that rides in the buffer tube behind the bolt carrier.
• It is compatible with any mil-spec AR15 rifle action spring, so common replacement springs match it.
• It is compatible with the A1 buffer tube, the rifle-style tube it was designed around.
• CMMG states the buffer meets or exceeds mil-spec, a useful standard when mixing parts from different makers.

Frequently Asked Questions

What does this CMMG buffer work with? CMMG says it is compatible with any mil-spec AR15 rifle action spring and with the A1 buffer tube.

Is this the carbine buffer? No. This listing is CMMG’s AR15 rifle buffer assembly. CMMG sells a separate carbine buffer assembly for carbine-style setups.

Buy the CMMG Buffer Assembly, AR15 Rifle

A fresh buffer is one of the cheapest ways to keep an AR15 lower running the way it should, and CMMG builds this one to meet or exceed mil-spec. Order it from our Lubbock, Texas shop with fast, insured shipping, and see more from CMMG in our AR buffer system parts selection.