Dos Boot by DFCO a low-profile, impact-resistant base plate upgrade for Magpul PMAG GEN M3 magazines that adds +2 rounds, improves prone stability, and gives a better grip for faster, more confident reloads. Designed to sit low to the ground (especially on 20-round mags) so your rifle grip stays clean while providing a contoured surface that functions as a monopod aid and improves handling. Product Details Product: Dos Boot base plate / magazine extension Manufacturer: DFCO (Die Free Co) Compatibility: Magpul PMAG GEN M3 10, 20, 30, and 40 round models Function: Adds +2 rounds of capacity; improves grip and prone stability; monopod aid Installation: Tool-less, drop-in replacement Material: Impact-resistant injection-molded polymer Made in: USA Colors: Black, Coyote Brown Features & Specs +2 Magazine Capacity (adds two rounds) Tool-less, drop-in installation no tools required Impact-resistant injection-molded polymer construction Aggressive tread pattern for solid contact and positive handling Convex/contoured shape for smooth positional adjustments and improved ergonomics Enhances prone stability and keeps rifle grip off the ground (optimized for 20-round mags) Versatile fit works on 10, 20, 30, and 40-round PMAG GEN M3 mags