DealThe Adams Arms Gas Piston System is an end user installed after-market product for Mil-Spec ARs. It will fit on any AR barrel with a .750" or 3/4" diameter at the shoulder where the front sight base sits. The Pistol version will work on barrel lengths from 7.5" to 8.5" that has an exsisting pistol gas system. from RifleGear.com (Product AA-PPS) |