Iron Airsoft CNC Gas Tank for Marui M870 Tactical Shotgun (100 shots) 
CNC Metal Construction 
Can shoot about 100 shots when the tank fully charged 
Gas Tank for Marui M870 Series Airsoft Shortgun 
Able to Inject Top Gas in Tank As well as Increase the Muzzle Velocity 
Constructed of Full Metal housing that is strong to drop on the floor