AEA AEA Megalodon vs Challenger air tube size

Hey you Air Heads,

Can anyone advise if the front air reservoir on the Megalodon is the same O.D. as the Challenger tube?

If comparisons are not possible, can someone caliper the O.D. of one guns tube, post that and I'll wait for the other O.D. to be kindly provided by another air brother.

The reason I ask is to see if I can fit the Huma Challenger Big Bore regulator to the Megalodon without making a plumbers nightmare out of the gun. It looks like the Challenger Elite comes with a regulator fit that way, BUT, the Challenger has the air reservoir in two parts with a screw joint.

Best wishes and thanks,

Mike