Gor mine just past the serial number range where they fixed all the problems. This thing runs like a raped ape. 5x PA prism on top and Griffin linier comp on the front hanging off a Vickers blue force sling. Magpul locking buttstock . Runs off Magpul and DPMS metal mags great. The suppressor setting on the gas system works great. Any votes for it being the best AR 10 platform ever offered?