The Phase 5(TM) PMR-Dimpled is a CNC machined 6061-T6 billet aluminum magazine release button. Easy to install, the PMR is a drop in component that replaces the Mil-Spec magazine release button. Including a dimpled design on the button face, the PMR adds style and keeps the function of a Mil-Spec button. Fits AR 5.56/.223 and 7.62/.308 receivers. FINISH: This product has a anodized finish. Mfg: Phase 5 Tactical