CMMG 55CA977 AR – 15 BUFFER ASSEMBLY

Description

CMMG 55CA977 AR-15 Carbine Buffer Assembly is confirmed. Here is the finished description:

The CMMG AR-15 Carbine Buffer Assembly (55CA977) is a mil-spec replacement and build component designed for AR-15 and M4-pattern rifles running carbine-length buffer systems. This AR-15 carbine buffer assembly is a dependable option for builders, owners upgrading worn components, and shooters setting up a new carbine for range use or home defense.

Key Features

Manufacturer part number: 55CA977

UPC: 815835013497

Platform: AR-15, M4-pattern rifles

Buffer type: Carbine

Weight: 3.2 oz (approximately 85 grams)

Internal weights: 3 steel weights

Finish: Silver

Compatibility: Fits standard M4 and carbine-length buffer tubes, including CMMG Fastback receiver extensions

Specification: Meets or exceeds mil-spec

Package weight: 0.30 lbs

Special Features

The three internal steel weights give the buffer its precisely calculated 3.2 oz mass, which is matched to standard carbine-length gas system timing and cycle rates.

CMMG manufactures this buffer to meet or exceed mil-spec tolerances, so dimensions and weight are consistent with the specifications AR-15 action springs and buffer tubes are engineered around.

The silver finish resists corrosion and wipes clean easily during routine maintenance, keeping the buffer tube interior free of buildup over time.

This buffer is compatible with CMMG Fastback receiver extensions in addition to standard M4 and carbine-length tubes, making it a versatile fit across a wide range of AR-15 builds.

No modification or fitting is required. The 55CA977 drops directly into any compatible carbine buffer tube alongside a standard carbine action spring.

Practical Benefits

Builders assembling a new AR-15 lower will find this buffer covers the carbine-length system from the start without needing to source a weight-matched component separately.

Shooters replacing a worn or damaged factory buffer get a known-spec part that restores the cycling behavior the rifle was designed to deliver.

The 3.2 oz weight works across the wide range of ammunition types commonly used in carbine-length AR-15 rifles, from standard 55-grain .223 loads to common 5.56 NATO pressure loads.

Owners who run their carbine hard on the range will appreciate a buffer built to mil-spec, where consistent internal weights translate directly to reliable cycling round after round.

Your AR-15 build or repair deserves a buffer that holds to specification, and the CMMG 55CA977 gives you exactly that without guesswork.

The CMMG AR-15 Carbine Buffer Assembly (55CA977) is a solid fit for any shooter or builder who needs a reliable, mil-spec carbine buffer that installs without compromise and cycles consistently over time.