I'm sorry guys, nobody took pics of the mods.
I've seen that Norinco Lector is talking about. It has the look completely changed. I had to stare long time to understand what gun it was. And it had a longer bull barrel I think.
Hey Doc, if I buy one tommorow, how much do you say you charge for these modifications?
I don't charge because right now I don't have time for anything.
The barrel was a bit longer, yes, 19.5" (but it was not "bull" barrel).
The owner did not even bother to change the classification (yet)
due to the barrel lenght.
It is actually kind of funny you said "bull" barrel,
(everybody else said that it appeared skinny(er),
probably because it doesn't have front sight).
To install a barrel of bigger diameter is not so easy,
because then you have to mod the clamping diam for all the crap
from the gas system that stays on the barrel
(modified for the new diam of the barrel).
It's not impossible, but you probably have to find someone
with a lot of determination to make and install a bull barrel on 97.
This particular barrel change was not exactly done by me.