Edgun barrel size and type

As far as what barrel the Edgun has on it, That would be a Lothar walter barrel. What size internally, I would think you could push a pellet through the barrel and do some measuring. To do that you would have to take off the reciever, which is an easy job 4 bolts that hold the reciecer on, that way you could take a dowl rod and push the pellet through the bore. As far as measuring I am not sure if you measure the inside of the lands or where you would measure at. I would email Ed directly with a pm and ask him, he would know. Another way would be what they call a snap guage, in this case it would be an expanable ball you can adjust, lightly have it touch the inside of the bore then use a mic to measure it, calipers would not work you would need a 1 inch micrometer, they are not expensive, but maybe someone will chime in that would know excatlly what you need to do.