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Would an 12V air compressor be enough to power a pneumatic rifle?

Although I have a larger air compressor available I was wondering if a more portable 12V would be sufficient

Picture of Would an 12V air compressor be enough to power a pneumatic rifle?
CO2 much better than a 12v mini compressor. Depending on the size air chamber in your gun, you would just have to buy a bunch of tanks or just 1 big one. Although you have to pay to recharge the tanks it is really cheap, usually around $5-6 for a 20oz tank which last along time. Here is a link to what i use on my air cannon and it works great. http://www.northerntool.com/shop/tools/product_200385985_200385985
Pressure and flowrate for the pump ? Capacity of barrel of gun ? required trigger pressure ?