Phase 5 Weapon Systems Inc Oversized Magazine Release AR15/.308 Black Small. Installation is easy and requires no gunsmithing. Both the OMR button and paddle are machined from 6061-T6 billet aluminum for a lightweight strong design. Specifications for Phase 5 Weapon Systems Inc Oversized Magazine Release AR15/.308: Manufacturer: Phase 5 Weapon Systems Inc Gun Make: AR Platform Gun Model: AR308 AR-15 Model Generation: 1 Hand: Right Fabric/Material: 6061-T6 Aluminum Size: Small Weight: 0.25 oz Features of Phase 5 Weapon Systems Inc Oversized Magazine Release AR15/.308 Larger contact surface than a Mil-Spec magazine release button Ergonomic pocket on surface of paddle for your finger CNC machined from lightweight 6061-T6 billet aluminum for strength Compatible with Extended Bolt Releases Compatible with Anti rotation trigger/hammer pin sets Available in different anodized color finishes Fits AR 5.56/.223 and 7.62/.308 receivers. Package Contents: Phase 5 Weapon Systems Inc Oversized Magazine Release AR15/.308 What firearm models does the manufacturer say Phase 5 Weapon Systems Inc Oversized Magazine Release AR15/.308 is compatible with? The manufacturer suggests that Phase 5 Weapon Systems Inc Oversized Magazine Release AR15/.308 is compatible with AR-15 AR308Phase 5 Weapon Systems Inc OMR-BLACK: Oversized Magazine Release AR15/.308 Black Small