Bringing this back up. the shotgun now looks like this one.
I added a speedfeed IV stock and forearm. the trigger group has an upgraded heavy carrier dog follower spring, a heavy sear to give it a 8 pound trigger pull, and heavy police magazine spring. the chamber and bore have been polished. this gun is better than new, and the armorer that showed me how to do these mods sells this exact gun for 525 dollars plus tax and xfer fee. i have ran about 50 rounds through this gun test firing it. it fires every time and works smooth as butter. i want another ar15, so i am sacrificing on this.