conversion ?

with all the FX smaller bottles being sold /used i am wondering if one can convert to a fill tank ? my pistol has a 40 cc air supply and my Leshiy classic is also 40 cc so a 400cc gun bottle seems like a nice size to carry .
BUT ..... is the tank plus fittings going to put me in the ball park of a Guppie tank ?

FX 500cc Standard Bottle w/ Valve = $99/95 plus fittings and reg. ??????​

 
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