So, I got the legal trigger group and gas piston. Then just now i finished pressing in the barrel and barrel pin. my first try (about a month ago) was the BFH method. and apparently my lineing up abilities failed me that day. so i knocked/pressed it back out and tonight i pressed it in. lined it up and pressed in the barrel pin, GO me. so now i have less to do. I did a mock "throw it together" to test fitting and I am running into a few problems. first when i try to cycle it, it will stick. i dont know if this is the new gas piston or if its the reciever binding on the bolt carrier. second the dust cover doesnt fit. its too short. i think this is all my faut and that i have not placed the rear trunnion correctly. as you all know this is my first build and i would like anyones (you know who you are) opinions. this reciever needs the holes that were drilled in it filled so i can redrill them, at this rate ill buy another reciever before i find someone local to do that for me. thanks for all your help on this long drawn out project.