Bought a RRA lower $109, RRA two stage trigger and parts kit $149, cheap carbine stock and buffer $20 (local classified ads). Assembly was a piece-o- cake, until the buffer retainer spring and pin took flight! After 20 minutes of swearing and searching on hands and knees, I found both, and now all is good. Won't be able to afford an upper for a couple of more weeks. But am leaving town for work, so it will give me time for research, and of course FTF reccomendations!