MasterPiece Arms MPA57sst in ATACS Camo Posted July 20, 2012 in Pistols by Steve Johnson with 34 CommentsTags: 5.7mm, ATACS, handguns, MasterPiece, pistol MasterPiece Arms MPA57sst, chambered in 5.7x29mm, is now available with a ATACS camo finish. This model features adjustable sights, a side-cocker, scope mount and muzzle break. The MSRP is$660. Win a Kel-Tec PMR-30 !!!