The STT Ultra Grip Bolt Catch is a drop-in replacement for standard MIL-SPEC options. The thumb pad features the San Tan Tactical Ultra Grip Texture, which offers positive engagement and enhances any rifles appearance. The enhanced non-slip grooves and ergonomic paddle design allow for intuitive actuation, even with gloves.Features :Black Oxide FinishCast A-2 Tool SteelMil-Spec CompatibilityDrop-in Design