This is an earlier HK MR556 with the heavy barrel profile. It has the Giessele 14.5 rail and charging handle as well as the stocks. WIll come with everything it had when purchased new including the HK bag, mag and flip up sights.Gun has had less than 200 rounds ran through it. WIll sell outright for 3800.00 OBO. with everything mentioned. Can include an Aimpoint T2 on a Scalerworks mount for the right trade. Only interested in Knights 11.5 upper with cash on your end or complete rifle. Willing to travel within reason for the right deal. Located in Tyler. I will only respond to text messages. 9o3-658-1168.