These Scope Base Picatinny Rails from Modular Driven Technologies provide a rock-solid platform for mounting your scope rings, with greater flexibility in scope choice and eye relief than traditional ring-and-base systems. Slots cut to true MIL-STD 1913 specs accept both Picatinny and Weaver-style rings for increased scope-mounting options. MDT Scope Base Picatinny Rails are designed with a 20 MOA incline, providing additional elevation adjustment for your scope. Underside of the rails are profiled to allow the rail to be mounted flush on the receiver and match the geometry of the ejection port. MIL-STD-1913 & STANAG 4694 spec rails 6061 T6 aluminum construction Mfg: Mdt