The WE SCAR-H 31-Round Spare Magazine (Tan) is a gas blowback (GBB) magazine designed specifically for the WE-Tech SCAR-H / MK17 series of rifles. 
 
 
Key Specifications
Capacity: 31 rounds (6mm BBs).
Compatibility: Designed for WE-Tech SCAR-H Open Bolt GBB rifle series. It is also compatible with Cybergun-licensed SCAR-H GBB models produced by WE.
Power Source: Optimized for Green Gas and HFC 134a/22 gases.
Construction: Full metal body with a plastic base cover.
Weight: Approximately 510g to 535g.
Features: Includes a high-flow outlet valve, durable silicone seals, and a lock-open/dry-fire capability.