JAC M4 Gbb
Not sure if thats good power,why would you be ussing that type of gas in that rifle,when CO2 can bring your fps up to 450?After all you can use an external cylinder and regulator for it,thats what I have for my JAC M16A2.You just have to remember to lubricate more often ussing CO2.You can even get the same power from compressed air,but the tanks are more expensive than CO2 tanks.
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