Will pay half shipping Upgrades: shs gears (not sure what ratio) Srs piston and piston head (some wear) Shs 8mm bearings Shs high temp wire harness New shs anti reversal latch New shs cutoff lever Modify flat hop bucking/nub Black python 6.03mm barrel Includes: knights armament vertical grip Scar style flash hider and supressor Removable barrel extension Angel custom 6.01mm tightbore Red dot sight in photo 120rd amoeba midcap 450rd highcap Original handguard E&c voltr style receiver