Monstrum Tactical 30mm Cantilever Dual Ring Scope Mount with Quick Release, Offset Design, Picatinny, Heavy Duty Scope mount for mounting standard 30mm tube rifle scopes Mounts to any standard Picatinny rail equipped rifle Attaches and detaches quickly and easily via integrated quick release mechanism, without additional tools or tightening 3 inches of offset forward extension allows extra flexibility for optimum eye relief and shooting position Light weight aerospace aluminum construction