I just finished AR-15 #42 in my collection. I had an old DPMS lower laying around that I replaced and I wanted to do something with it. I had to think about what I did not have. Well, an A2 CAR lightweight came to mind, so I did one. I bought a CAR mil-spec 4-pos. buttstock assembly from Model 1 Sales. I have used a few of these on retro AR builds and they are great. I used one of the many A2 pistol grips I have had laying around and finished the lower assembly. I, then, ordered a charging handle and 16" A2 CAR lightweight upper assembly (1/9, chrome-lined) from Model 1 Sales. BTW, I have been impressed with M1S barrels for some time now. I used an older semi-auto AR-15 BCG I had. The UPS truck came in just a short time ago and I quickly snapped everything together. Here it is. All together, about $625 into it counting what I paid for the lower to begin with.