A&K - M4/15/16 P-Mag Style 300rnd Hi-Cap Magazine - Black is a High Capacity Magazine, designed for use with STANAG accepting 6mm Airsoft BB Guns. The magazine itself is constructed with a durable Polymer Outer Shell and Polymer Internals. Holding up to 300 BB Rounds, this High Capacity Magazine is fed by winding the wheel at the bottom of the magazine, which due to its ridged design, can be done even when wearing bulky gloves. Just like a real P-Mag, this magazine's external shell features a textured and embossed surface, allowing users to grip it with ease. Adding a nice element of authenticity to this magazine, there is a window cut into the side, which on a real P-Mag would reveal how many bullets were left in the magazine. This magazine is perfect for those Airsoft Skirmisher who want extra rounds for Fully Automatic Fire. Lightweight amd with an eye-catching and modern appearance, these magazines are a brilliant way to carry 6mm BB ammunition in a slightly more realistic manner.