Yeah... (edited: more pics)

Let me see if my cell phone can do a better pic, or pics...

I assume the Crosman intermounts will now work since the barrel is 7/16" diamater now. Did have a set, but traded them off a while back...

Be right back!

Notice the end plug. There is a slight radius removed equal to that of the tube. The removed portion is only as thick as the lip on the plug.

You can see my sweet solder job! Yeah, I am self centered on it! My first attempt at soldering on a Benji and it went too well!! You will also notice how the added tubes mate up evenly and centered on the breech taper.

I measured all the tubes (diameters), even the pump tube, then crunched the math as to how much the tube will need to be removed each time a tube was added, as the barrel got thicker by the layers.

My only question is if the head annealed the metal or not (?). Next, it will be media blasted then a nice coat of gray (or grey) appliance epoxy for that parkerized look. Any better ideas on paint?