Shop › AERO AR15 FIX-IT-KIT AERO AR15 FIX-IT-KIT $17.99 Aero Precision Fix it Kit, Includes Takedown Pin Detent (4), Takedown Pin Spring (4), Bolt Catch Roll Pin (2), Trigger/Hammer Pin (2), Safety Selector Spring (2), Safety Selector Detent (2), Buffer Retainer (2), Buffer Retainer Spring (2), Disconnector Spring (2), and 4-40 Set Screw (for Threaded Takedown Pin Detent Hole) (2) APRH101627 Add To Cart Added! Aero Precision Fix it Kit, Includes Takedown Pin Detent (4), Takedown Pin Spring (4), Bolt Catch Roll Pin (2), Trigger/Hammer Pin (2), Safety Selector Spring (2), Safety Selector Detent (2), Buffer Retainer (2), Buffer Retainer Spring (2), Disconnector Spring (2), and 4-40 Set Screw (for Threaded Takedown Pin Detent Hole) (2) APRH101627