If someone somewhere was contemplating building a new break barrel springer and wanted to sell it in the U.K., Europe and the US with the bore/stroke/power level optimised for each of those markets.....

Clearly for such a gun to be commercially viable the minimum number of market specific parts would be critical, if we assume the barrel, breech block, back block, stock, trigger and potentially iron sights would have to remain common....

Is it conceivable that 3 different cylinder and piston units could be designed to be dimensionally identical externally yet bored to suit the 6, 12 and 30ft/ib markets, in the manner of the various reduced bore HW80 conversions?

Guns could then be assembled and finished according to their market without having effectively three totally separate sets of parts or compromising everything in a single product...

There must be a flaw with this somewhere gentlemen?