Added a speedfeed 13" stock and forend, shortened the barrel to 20.5", opened up the gas port 2 sizes, added xs ghost ring sights with banded front sight. The speedfeed stock I will say was a poor fitting piece and didnt come with the hardware to make it fit correctly. I had to sand and shim a few things but its a tight fit now. The front sight is made for a barrel .860-880" and mine measures .840 so I made some shims out of .016 aluminum strips and used the specified side shims for a .872 barrel. The rear sight had to be drilled and tapped which had me nervous but wasn't too bad.