I have for sale 5 boxes (50 rounds per box) of the much vaunted Black Hills 5.56 NATO 77 gr. SMK/OTM, known by the military designation Mk. 262. Two boxes are seconds, meaning some of the rounds have slight blemishes, but in no way affects cartridge performance. The only difference between this and the G.I. ammo is the box. If you have an M4, this is in my opinion, the best ammo on the market for it. I would prefer to sell this as a lot. Asking $250 or $50 a box.