Product Description ARCTURUS M4/M16 Metal 30/135Rds Variable-Cap EMM Magazine (QPQ) Enhanced Construction: One-Piece Reinforced Magazine Shell Modular Internal: Easy Disassembly for Cleaning & Maintenance Modular Shell: Quick Replacement for Optional Shells Various Capacity: Switchable Mid/Real-Capacity or High-Capacity Lengthened Follower: Snap-free & Optimized Feeding up to Last BB Impact-Absorbing Design: For Outstanding Reliability Reinforced Material: For Long-lasting Durability Customer Reviews