Fostech Anti-Walk Pin Set AR. Fostech pins are some of the toughest pins produced. Designed to withstand the stresses generated by high-impact suppressed and Echo fire. Fostech Anti-Walk trigger/hammer pin sets prevent wear on your AR lower and prevent your pins from walking out of your receiver. Specifications for Fostech AR Anti-Walk Pin Set: Manufacturer: Fostech Gun Model: AR-15 Features of Fostech AR Anti-Walk Pin Set No permanent modification to your gun is required Package Contents: Fostech AR Anti-Walk Pin Set Anti-Walk Pin Plates Anti-Walk Pins Bolts for Ease Assembly What firearm models does the manufacturer say Fostech AR Anti-Walk Pin Set is compatible with? The manufacturer suggests that Fostech AR Anti-Walk Pin Set is compatible with AR-15Fostech 2506: Anti-Walk Pin Set AR