The Marble Arms 31-W Front Sight is a precision barrel-mounted rifle sight designed for .312" diameter barrels with a 3/32" brass gold sight post.Marble Arms Model 31-W Front Sight.312" barrel mounting diameter for secure fit3/32" sight post for precise aimingBrass gold construction for durability and visibilityBarrel-mounted design for reliable positioningIdeal for rifle accuracy improvements and target shooting applications this front sight provides reliable performance for serious shooters and hunting enthusiasts.