The Badger Ordnance UX Rail is a versatile, one-piece MIL-STD 1913 Picatinny scope base that gives you a lot of flexibility in scope selection. It also enables fast, simple changes to eye relief. Brownells Gun Tech(TM) Note: The Badger Ordnance UX Rail fits ONLY the clip slot feature of the Remington 40X action or M700 model action modified to the USMC M40A3/A5 spec. Machined from pre-hardened, ordnance-grade 4142 carbon steel Hard, anti-corrosion matte black mil-spec manganese phosphate Parkerized finish Integral recoil lug ensures this base is a rock solid and stable as St. Peter A heavy-duty, tactical mount, the Badger Ordnance UX Rail is available wit Mfg: Badger Ordnance