The MFT Extreme Duty, product number EXDPM556-W-BL, by Mission First Tactical signifies the convergence of advanced material technology and superior manufacturing procedures. This product is meticulously designed to go beyond the rigorous military performance specifications by providing augmented strength, durability, and reliability.It features robust dual-side anti-glare transparent windows marked with numerals along with a high visibility coil on the spring. This thoughtful design ensures quick and easy visual identification for approximating the number of rounds left.While it is perfectly tailored for AR15/M4, its versatile construction enables compatibility with a wide variety of non-AR15/M4 platforms as well.