Utilizing new material technology and manufacturing processes for enhanced strength, durability, and reliability to exceed demanding military performance specifications. Durable dual-side anti-glare transparent windows with numerical markers and high viability indicator coil on the spring allow quick visual identification of the approximate number of rounds remaining. Designed for the AR15/M4 but allowing use with a wide range of non-AR15/M4 platforms. EXDPM556 Features and Functions: ? Dual-side windows with numerical markers ? High visibility coil on the spring ? Next Generation Long Glass Fiber Polymer ? Enhanced Strength & Durability ? Ribbed front and rear gripping surface ? Tool-less disassembly with double floor plate safety release tabs ? Long-life USGI-spec stainless steel spring ? Four-way anti-tilt self-lubricating follower ? Flared floor plate? Oversized bolt catch ? Paint Pen dot matrix