Umarex Gas Magazine for Glock 17 Gen5 GBB airsoft pistol with 23-round capacity. Built to exacting standards under official Glock license, this metal magazine delivers consistent performance and reliability. The precision-engineered release mechanism and sealed construction minimize gas loss while maintaining stable operation shot after shot. Ergonomic design enables swift reloads, while the secure magazine catch lock prevents accidental displacement during tactical use. Compatible with Green Gas propellant. A premium choice for serious airsoft operators demanding dependable feeding and performance from their GBB platform.