MasterPiece Arms BAMOUNT301125: The BA Series Mounts are made for mounting high performance optics onto bolt action rifles with Picatinny rail scope bases. 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. Provides the ability to confidently move the optic/mount to multiple rifles with simple windage and elevation adjustments. Superior clamping surface to ensure maximum rail engagement. This mounting system is designed to handle large objectives up to 56mm (34mm Mount) and 50mm (30mm Mount). This system provides over 3.5 of rail interface providing extreme lockup on the host rifles scope base.