The 
WE Europe EU19/EU23 Gas Magazine
 is a replacement or spare magazine designed specifically for the WE series of Model 19 (EU19) and Model 23 (EU23) gas blowback airsoft pistols. 
 
Key Specifications
Capacity: 20 to 22 rounds (double-stacked).
Construction: Full metal (alloy) body with polymer feed lips and a removable polymer base plate.
Power Source: Designed for Green Gas (standard gas blowback).
Finish: Matte black.
Weight: Approximately 260g.