I just purchased this new Bushmaster XM15-E2S and am already looking at upgrading to a preban carbine of some sort. This has the 20" A-2 spec barrel (not HBAR), and the A-2 sights. I ran 60 rounds through it to sight it in and it functioned 100%. Comes with all original (unused), accessories including warranty card.
Price is $725 delivered to your FFL or will apply to trade for a pristine Colt carbine with removable carry handle.