Elite Force H&K UMP .45 Gen 2 Airsoft AEG Electric Blow Back SMG - Black Grenade Launchers Outer Diameter of main barrel:

Outer Diameter of main barrel: 1

As if all of that wasn't enough

corrosion-resistant

Objective Diameter: 32mm

The Sig MCX does not include a tank

Elite Force H&K UMP .45 Gen 2 Airsoft AEG Electric Blow Back SMG - Black Grenade Launchers Outer Diameter of main barrel:Features Durable and lightweight nylon reinforced polymer construction with stamped H&K licensed trademarks Side folding stock allows for easy stowage and compact carry Front 20mm accessory rails are ideal for mounting weapon lights, vertical grips and other accessories, the integrated 20mm top rail is ideal for a wide variety of optics Functioning mock charging handle and bold enhances realism and makes hop up adjustment easy Extrememly realistic