Ar-15 in .223. I built this rifle for coyotes and it makes light work of steel at 300 yards with minimal effort. Parts: Stag upper, Spikes spider lower, Rock River Arms 2 stage varmint trigger, Eres Armory Effin A' muzzle brake, K&S anti-walk pins, Magpul "bad" lever, 16" Begara heavy contour barrel 1:8, Magpul ACS stock, Magpul MOE plus grip, Daniel Defense RIS II in FDE 12.25", and a Spikes Tactical BCG. Scope is a Primary Arms 4-16...this was my first Primary Arms optic and honestly its pretty decen comes with the Butler Creek scope caps also. Looking to trade for a quality hunting rifle in either .270 or 6.5 cm. Possibly open to other calibers just let me know what you have.