The RELOAD M4 Lightweight 30-Round CO2 Magazine (compatible with VFC AR, M4, and HK416 GBB series) weighs 310g–315g, holds 30 rounds, and uses a standard 12g CO2 cartridge. 
 
Key Features:
Capacity: 30 rounds
Weight: ~310g to 315g
Propellant: Uses a single 12g CO2 cartridge (inserted from the bottom)
Compatibility: Designed specifically for VFC AR, M4, and HK416 Gas Blowback (GBB) series.
Function: Features a dry-fire capability.