The Warne Hyperlite 1-Piece MSR Scope Mount available in 30mm or 1 inch for picatinny rails. The Warne HyperLite MSR Mount is the ultimate lightweight optic mounting solution. Crafted from their exclusive MagnaFusion Alloy, this 1-piece mount offers a staggering 35% weight reduction over traditional aluminum mounts without compromising on strength or stability while providing an unbeatable foundation for your optic.Scope Mount fits: AR-15, M-4, SR-25, LR308, PTR-91, and any other MSR with a Picatinny rail that is at least 3 inches long.