I have a DPMS Upper(put about 200) round through it. This is an A1 upper. Heavy weight barrel, 14.5" with no muzzle attachments. Bought it new but the previous owner decided to eliminate the muzzle break and never got around to threading the barrel so not it is just flat. It comes with a chrome carrier and bolt. Also have a 4 position colasping stock with spring and buffer. It is in good shape though a bit dinged up here and there. Mechanically perfect, what little I have used it I had no problems. I would like to get $375 for the set but willing to take offers, or maybe trades.