Yes.
No
It shouldn't. You should only use products manufactured for your firearm on that firearm.
What is the thread size for a Winchester Model 90?
In this model of Winchester rifle,there is no difference in value between the round or octagon barrel.
No
model #24
I need to clean the barrel, not like a model 12.
No.
The model number should be stamped into the barrel near the Winchester name. It will say "model" or "model of"
Best left to a gunsmith.
No
Probably Winchester.