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This is our universal Retainer Spring. It's compatible with AR-15 and AR-10 buffer tubes in bot..
Includes:Lower Parts Kit ExcludeTrigger and HammerAR-15 M4 Six Position Buffer Tube Kit -Mil-SpecAR-..
Includes:Lower Parts Kit w/ Standard Grip & Trigger GuardAR-15 M4 Six Position Buffer Tube Kit -..
The extended and grooved head on the pin makes separating the upper and lower receivers easier and f..