Preban 16" Bushmaster A2 Upper. The barrel is a 16" chrome lined 1/9 twist bushmaster heavy that was on my flattop DPMS for about 750 rounds before I bought my M4 barrel and the upper was an A2 off my brother in-law's rifle for about 1200 rounds until he got a flattop. We had the 2 assembled to make a spare upper, but need the money for other projects. They are both bushmaster and it is complete minus b/bc/ch. It is in great condition and runs well. Would be a great upper for that postban conversion. $350 OBO plus actual shipping.