Cmmg Rifle Buffer Assembly Ar15

The CMMG Rifle Buffer Assembly AR15 is a purpose-built replacement buffer system engineered for AR-15 platforms configured with rifle-length receiver extensions. CMMG manufactures components to exacting standards for the modern operator, and this buffer assembly represents a direct replacement for wear, damage, or platform reconfiguration across a wide range of rifle-length AR-15 builds.

Rifle-length receiver extensions (also called rifle-length stocks tubes) position the buffer assembly deeper in the lower receiver than carbine-length systems, affecting bolt carrier group dwell time and recoil impulse management. A proper-fitting buffer—one designed specifically for rifle-length geometry—ensures consistent cycling with your ammunition selection and maintains reliable function across the velocity spectrum. The 0.38 lb weight of this assembly falls within the standard range for rifle-length buffers, supporting balanced recoil management without sacrificing reliability.

This assembly is essential for shooters rebuilding rifle-length AR platforms, upgrading worn components, or transitioning between calibers where buffer specifications require updating. Law enforcement armorers and precision rifle builders rely on CMMG components for their dimensional accuracy and consistency. Whether you're running a rifle-length 223 Remington, 5.56 NATO, or have moved to intermediate or specialty cartridges, having the correct buffer assembly matched to your receiver extension geometry is fundamental to reliable semi-automatic operation and predictable accuracy performance.

Verify your AR-15 uses a rifle-length receiver extension before ordering. Carbine-length and mid-length extensions require different buffer systems. CMMG buffer assemblies are manufactured to mil-spec tolerances and compatible with standard mil-spec stocks and receiver extensions across the AR platform ecosystem.