Marushin M1 Short EXB2 Walnut 6mm Gas Blow Back Rifle (CO2/ Brass Piston) Magazine-Type_Gas Sniper Rifle Powered by 1x CR123A Length:

Powered by 1x CR123A Length: 94mm

Upgrade M120 Power up Spring

you can either buy a new CO2 tank (More than 10 brands you can choose from

More specific details could be found at this following:

Dynamic Precision Steel Fire Pin for Marui G17 / 18C GBB

Marushin M1 Short EXB2 Walnut 6mm Gas Blow Back Rifle (CO2/ Brass Piston) Magazine-Type_Gas Sniper Rifle Powered by 1x CR123A Length:The M1 carbine is an interesting little weapon. The original request for a compact and lightweight shoulder arm to replace service handguns for second line (non fighting) troops was first issued by US Army in 1938. The idea behind this request was that a shoulder arm, such as carbine, firing ammunition of moderate power, will have more effective range and will be much simpler to train the users to fire it accurately, than the standard . 45 caliber