I got one of those for Christmas too.
I have a nice custom tube that hasn't been shooting. Took a peak inside and guess what? Little spots of rust within an inch of the muzzle! Yes, this is worthwhile.
Thus, what should/will be done about those little spots of rust? And, the result?
Well, I can tell you what I'm NOT going to do - chase my tail trying to develop an accurate load for it. If it won't shoot a 77 SMK, it's on to more drastic measures like boring out the muzzle or just selling the thing with disclosure.
I'm JBing it now. We'll see if it will shoot the 77 after that.
