Like the title says this is a Mega Upper, on a Mega "pistol" marked lower. It has a 10.5" Shaw Chrome lined barrel, chambered in 5.56 so it's good to go with .223 as well. DPMS LPK (so you can use a .22 conversion down the road), YHM Quad rail, M.I. BUIS, also has the heavier Spike buffer and spring. Comes with one Magpul mag, Magpul sling mount (ACS I think?) and Magpul rail covers. This would be a great way to build a SBR, shoot it and enjoy while you are waiting for the tax stamp to come back then all you would need to do is add a buffer tube and stock (no changing barrels etc). $900, maybe open to interesting trades.