Crosman Crosman 2240 PCP

It can fit if you machine threads for the tube. Although I wouldn’t trust a 2240 tube that’s rated for co2 pressure. Might be making a pipe bomb. I’ve heard the non stamped 2240 tubes are ok but why take the chance? If you want a 2240 pcp tube I’ll sell you one that was built to hold 3000 psi. It was made by Don Cothran. Stainless steel with a fill assembly and fill cap. I will PM you.
 
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first of the 2240 tube isn't rated for any pressure because the tube takes none
the CO2 cart seals on the valve face
back in the day when there were few if any PCP pistol the 2240 was use as a base you pinned the valve got all the gear and made a low pressure PCP
be we are not in those times there are cheap PCP pistols out there for sale, in Mexico i have no idea