Up for sale is a very nice Sig 551A1 in 5.56. We don't see these as often anymore and this one is in really nice shape! It comes in the original case with 4 magazines and a trijicon acog TA33-H. The acog is really nice but it does seem like the glass is not as clear as they normally are. Perhaps biteigen leaked out. At any rate I'm sure it can be fixed by trijicon. It's still a very nice optic and works well. this gun is really epic.