Anderson Manufacturing Carbine Length Buffer Spring

The Anderson Manufacturing Carbine Length Buffer Spring is a critical bolt carrier group component designed for shooters building or maintaining direct impingement AR-15 carbines. This spring works in conjunction with your buffer and bolt carrier to manage recoil impulse and cycle reliability across a wide range of ammunition types and shooting conditions. Whether you're an armorer, law enforcement operator, or civilian shooter standardizing your platform, a quality buffer spring directly impacts reliability, longevity, and performance—making it non-negotiable for builds or repairs.

Anderson Manufacturing's carbine-length buffer spring is engineered to provide consistent spring force throughout the cycling sequence, ensuring the bolt carrier returns to battery with precision and the hammer resets reliably for every shot. The spring is precisely wound to mil-spec tolerances, delivering the correct rate and load distribution needed for standard carbine-length direct impingement systems. This component works seamlessly with standard carbine buffers (typically 3 ounces) and maintains performance across suppressed and unsuppressed fire, though tuning with heavier buffers may be necessary for heavily suppressed setups or short-stroke tuning.

Operators and builders who demand reliability in duty or defensive platforms benefit most from upgrading worn springs or standardizing on proven components like Anderson Manufacturing. Installation is straightforward: simply remove the buffer tube assembly, compress the old spring, slide the new spring into the tube behind the buffer, and reassemble. This spring is fully compatible with mil-spec AR-15 carbine buffer tubes and upper receivers using standard direct impingement systems. For best results, pair with a quality milspec buffer and tube; replacement every 5,000–10,000 rounds is recommended for high-volume shooters to maintain optimal cycling performance.