I have dont have problems working on stuff Im purty well mechanically inclined I just didnt know if any parts needed fit together to work right on an AR like some hand guns need barrels fit and stuff like that, i have a stag lower coming should be here early next week, I got a trigger kit from del-ton, i need to get a buttstock yet to finish the lower, ill probably get a good trigger down the road but for 55 bucks for all the bottom parts to finish off a stripped lower ill spend that. Im probably going to get RRA or DPMS parts for the upper, I really like the RRA upper, and was thinking about ordering that, I just dont have 600 bucks to order a complete upper right now but id like to keep the build moving along.