With several new models released by ERA-TAC in 2017Short-Version One-Piece Mountsare suitable for use with any bolt action or AR10-type rifle.Fully-machined from solid high-grade aluminumAll parts are Mil-spec Type-III anodized (black) rendering them corrosion-proofAvailable for 30- 34- and 36-mm scope tubesMPN series T10xx secure with safety leversMPN series T20xx secure with nutsAll versions available in 0- and 20-MOA inclination.ERA-TAC Gen 1 - 30mm