I would have done this sooner but had camera problems.
Well first a big thank you goes to 1Biggun for his excellent work he did with the barrel. So if you need some lathe work done get a hold of him and see if he can help.
He had a barrel for another project that didn't work out and he made it work for mine "wants". Originally my PPSh rifle had an original barrel with a steel tube welded to it to bring it out to 16"+, now thanks to him I have a 16"+ barrel.
Here's a pic of an original barrel & the one he made for me, the main part of concern was the chamber end that had to fit the trunnion, he made it a few thousandths over and just a few minutes with some emery cloth got it fitted.