CMMG 55CA977 AR-15 BUFFER ASSEMBLY

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.