AR-15 Buffer Retainer Spring

Features

1. Mil-Spec Dimensions — Manufactured to mil-spec tolerances for a drop-in fit in any standard AR-15, M16, or AR-10 lower receiver.
2. Consistent Tension — Calibrated spring rate keeps the buffer retainer pin firmly seated against the buffer to prevent slip-by during cycling.
3. Hardened Steel Construction — Wound from heat-treated spring steel to resist fatigue, compression set, and corrosion over thousands of cycles.
4. Direct Replacement Part — Restores function on rifles where the original retainer spring has been lost, kinked, or weakened from use.
5. Compact Footprint — Drops straight into the buffer retainer detent hole at the rear of the lower receiver with no fitting required.
6. Carbine and Rifle Compatible — Works with carbine-length and rifle-length buffer tubes across the entire AR-15/M16 platform.
7. Essential Build Component — A must-have for any AR lower parts kit, spare-parts box, or armorer's bench.
8. United Defense Quality Control — Inspected for proper free length and spring rate before packaging to ensure reliable performance.