Prowin has been known for producing lightweight and much improved gas efficiency magazines for various platforms, from WA to Tokyo Marui. This 52 round extended magazine has the extended capacity of 52 round (+2 rounds when compared to the original Tokyo Marui extended G series magazine) and provides a much improved gas efficiency over the original Tokyo Marui G series magazines, it also shaved weight by roughly 30% from the original one.
Disclaimer: All aftermarket upgrade parts require necessary skill or modification to install and assemble, please consult with your airsoft technician if needed.