The Battle Arms Enhanced Bolt Catch offers Enhanced Control Surfaces, Better Ergonomics, Lightweight Engineering. Manufactured from 8620 Heat Treated Cast Steel, the Enhanced bolt catch has a Black Phosphate Finish. The Versatile Modular Design allows for Future Add-On Product/s. FeaturesOversize Control Surfaces for Easy EngagementLightweight but Robust DesignRaised "T-Shaped" Heel Provides Positive and Distinctive Control Surface for Bolt Lock BackCompatible with Norgon Ambi-Catch Without InterferenceElegant Tapered Control Surface and Skeletonized DesignBold Horizontal and Diagonal Serrations Provides Positive Purchase