These anti-rotation pins keep the trigger and hammer pins from rotating in their holes as the gun is fired.
AR-15 Anti Rotation Pins: Includes Allen Key, Hammer and Trigger Pins, Anti Rotation Locking Cam Pins, and Screws. Your #1 choice for reliability, durability, and superiority!
You don't need anti-walk pins!
Smyth Busters: Does Your AR-15 Need Anti-Walk Pins?
Guntec AR-15 Complete Anti-Rotation Trigger / Hammer Pin Set
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Results for anti rotation pins
AR-15 Complete Anti-Rotation Trigger/Hammer Pin Set (Anodized Black) » Guntec USA
Strike Industries Anti-walk/Anti-rotation Trigger/Hammer Pins
AR-15 Complete Anti-Rotation Trigger/Hammer Pin Set (Anodized Black) » Guntec USA
Cabinet Ware - Trinity Fixtures Australia