For best prices & free shipping, order your next Primary Weapons Systems 308 or AR15 rifle, pistol, lower or upper at Fortress Tactical! Discriminating shooters consider the PWS long-stroke piston system to be the best quality for the money. Back that up with awesome customer support, and it's an easy choice. Proud to be a factory-direct distributor, we specialize in MOD1 and MOD2 uppers, rifles & pistols in 223 Wylde, 300 Blackout, 308/762, 6.5 Creedmoor & 762X39.