The BA Series Mounts are made for mounting high performance optics onto bolt action rifles with Picatinny rail scope bases. It 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 offers over 3.5a ^2 of rail interface, which provides extreme lockup on the host rifles scope base. Mfg: Masterpiece Arms