The Double Bell 7961J is an 18-round gas blowback (GBB) magazine designed for the AM.45 Vorpal Bunny airsoft pistol series. It is constructed from a durable metal alloy and is primarily powered by Green Gas or Top Gas. 
 
Key Specifications
Capacity: 18 rounds of 6mm BBs.
Material: Full metal construction with a polymer baseplate.
Compatibility: Specifically designed for the Double Bell AM45 Vorpal Bunny (796-1 series). It is also reported to be 100% compatible with the Tokyo Marui and Army Armament R45 (Detonics) versions.
Design Features: Features a flared baseplate that serves as a grip extension for improved handling and comfort.