The 
G&G MGCR Series Gas Magazine
 is a proprietary, full-metal airsoft magazine with a 30-round capacity and a dry-fire switch, designed specifically for the G&G MGCR series of gas blowback rifles. 
 
Product Details
Capacity: Holds 30 BBs, offering a realistic, low-capacity experience for players who prefer a military simulation (milsim) style of play.
Construction: Features durable, full-metal construction for authenticity and ruggedness in the field. The gas router is made from a cold-resistant green rubber for performance in various conditions.
Compatibility: This is a proprietary magazine designed exclusively for G&G's MGCR Series Gas Blowback Rifles and is not compatible with any other GBBR system currently available.
Features: Includes a convenient switch on the top of the magazine to enable a dry-firing mode, useful for training or testing without feeding BBs. It is also fully compatible with standard airsoft speedloaders.