Manufacturer: Leupold 59245
Specifications and Features :
System employs a slot and spline design
Mark 4 Tactical Bases are the only bases to accommodate both the oversized 8-40 screw and a 6-48 screw, providing compatibility with the widest range of modern tactical firearms. Both styles of screws are included with each Mark 4 base.
Mark 4 bases accept Mark 4 rings, cross-slot rings, and QRW / PRW rings and any weaver and Picatinny compatible rings
Fits Savage and Stevens rifles with round receiver (post 2003)
Rugged steel construction.