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