For 2015 we teamed up with ATI to develop a tactical chassis for our semi-automatic rimfire platform the 512. Chambered in .22 LR it comes with a 16.5" barrel 1/2×28 muzzle threads top Picatinny rail 6-position stock and higher magazine capacity than the standard gun. One of the best features of the 512 platform is that it uses the same reliable single-stack mags as the 455.