Battle Arms Development AR Magazine Release Part Kit 1 Enhanced Catch Enhanced Release Black. Length: Shorter Threaded Pin to Reduce Installed Magazine Button Profile of Solid Face Magazine Release Buttons Weight: 0.25 oz (v.s. 0.32 oz Mil-Spec) BAD-EMR (Enhanced Magazine Release) for the AR15/AR10. Precision CNC Machined for billet 7075-T6 Aluminum (not 6061) in an anodized BLACK finish the BAD-EMR features an unique fully solid "V" shaped button face with horizontal serrations (no through hole). The concave V-Groove button face offers excellent ergonomic feel and self-centers the index finger as pressure is applied. The horizontal parallel serrations helps slippage in the vertical orientation while minimizing drag in the horizontal direction for finger retraction. The BAD-EMR also features a lightweight skeletonized back to offset the weight gained from the fully solid button face and slightly increased height to equal the weight of the standard mil-spec magazine release (approximately 0.002 lbs). BAD-EMR is compatible with all lower receivers that accepts mil-spec magazine release buttons. Product developed in conjunction with Forward Controls Design Specifications for Battle Arms Development AR Magazine Release Part Kit 1: Manufacturer: Battle Arms Development Gun Model: AR-15 Finish: Black Phosphate Finish Gun Type: Rifle Condition: New Package Contents: Battle Arms Development AR Magazine Release Part Kit 1 What firearm models does the manufacturer say Battle Arms Development AR Magazine Release Part Kit 1 is compatible with? The manufacturer says that Battle Arms Development AR Magazine Release Part Kit 1 is compatible with AR-15Battle Arms Development BAD-MRK-PK1: AR Magazine Release Part Kit 1 Enhanced Catch Enhanced Release Black