I have never needed to polish the tube, save your money.
Need to get a solid cleaning rod and use a shotgun bore brush to hold so fine grit sand paper, I only have spinning rods.Just spin it till all is smooth as silk. Mirror polish isn't needed.
That sounds like a waste of $60 to me. You could polish the heck out of it, close it up, and possibly never see the inside of the tube again.
Got it down to some worn 800 grip paper, mainly to smooth out and high spots and edges of the hols and slots, JB-WELD filled the stamping less AMERICAN CLASSIC and paining.. this will be the tube I build the Backpacker with. If I ever get the steel breech and 12" barrel from Alliance Hobby. Man he is slow.. I totally get the custom made parts, but stuff that don't require work could be shipped out.
Nothing yet, I had asked him if it was still going to be a while on the hammer, if it was I'd just get a new pin for now to hold me over, he did respond and said yes it's going to be a while, if I needed a std pin he would send me one, I asked if he would could he go ahead and send my second order out with it (steel breech and 12" barrel) I can wait on the hammer, no response. Seems when something isn't in stock it says no longer available on the website, you can't get 12" barrel from crosman anymore, so I would have thought he had bout up a bunch to have on hand, if he didn't don't advertise them.. I'll give it to the first of March and I'll ask for a refund and see if I get it.