Webley Tempest

[basa]

HI, never seen one of these before, just today, I came across a webley tempest, that was brought back from the USA, but the white poly insert,has a large square,cut out, were the pellet tin,usually is, and a large cardboard box of crossman usa, pellets, must be at least a thousand in the box, [box around the size, of those pint carton of custard ],sorry but just packed it away again,so only guessing, also the whole box/and insert, about a third bigger than the uk one,[, mk2 tempest the later brown box type ], just thought, anyone know if the power has been tweeked for the USA,thanks,chaps.