The AC-Unity GLOCK M17 window magazines 17RDS (17+2) cal. 9x19mm are made from advanced high-grade polymer, guaranteeing from maximum impact resistance and durability. Plus 2 capacity baseplate provides increased capacity with minimal increase in size. These magazines have a long lifetime and can survive maximum temperature fluctuations from -60°C to +60°C.  They will not break or crack when dropped or even when run over by an SUV. The material composition allows for long time storage, even when fully loaded, and the magazine lips will stay in the correct position and not spread or balloon because of spring pressure.  The magazines fit any 9mm Glock pistol as well as other weapon system operating with standard 9mm Glock magazines. Originally developed for our ALFA AC SMG9, this magazine also serves as perfect alternative magazine for any Glock user who prefers to have the possibility to see the remaining rounds from outside through the transparent window. The magazines can easily be disassembled and cleaned through the special base plate design.