FeaturesCompatible with standard mil-spec forged AR15/M16 receivers*Thin, anti-snag profile and textured surface still allows for traditional manipulation of the bolt catch while maintaining unobstructed access to the triggerAttaches to the existing bolt catch paddle via one screwMachined from durable billet 6061-T6 aluminumFinished with MIL-A-8625F, Type III, Class 2 hard anodizing with manganese phosphate on the screw per MIL-DTL-16232GTorx® mounting screw with Nyloc® Blue patch prevents back out under recoil (Torx wrench included)* NOT compatible with 7.62×51 (.308 Winchester) firearms as well as most AR15 billet or polymer lower and upper receivers due to their larger and/or non-standard dimensions (including the S&W Magpul Spec Series™ lowers).