Bolt Action Mount Features The BA Series Mounts are made for mounting high performance optics onto bolt action rifles with Picatinny rail scope bases. Pic rail to scope center line height varies. 1a ^2 & 30mm versions are 1.060a ^2. 34mm are 1.060a ^2 1.125 1.250 & 1.500. The 35mm & 36mm mount measurement is 1.250a ^2. The mount is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. Horizontal split rings. The interface ensures positive engagement for both in spec and out of spec rail systems. Absolute return to zero via multiple locking lugs located on the bottom of the rail interface. This system provides over 3.5a ^2 of rail interface providing extreme lockup on the host rifles scope base. Our NATO spec rail interface system pulls the mount onto the top of the pic rail providing over 200% more rail contact than other competitive mounting systems that pinch the rail. Bolt Action Mount Specifications Brand: MasterPiece Arms Length: 4.760a ^2 Material: Aluminum Ring & Mount Finish: Anodized Ring & Mount Pieces: 1-piece Ring & Mount Tube Diameter: 34mm Ring & Mount Type: Picatinny Style Weight: 6.8 oz