You don't give much real info to answer your questions.
Never heard of a "one-piece" rifle that can't be taken apart.
It's apparently a single-shot of some sort, you're saying?
What caliber?
Why do you want to cut the barrel?
Generally, unless you have the gun clamped tightly & perfectly square to whatever cutting blade you're using, there's a risk of cutting it off leaving an angle to the muzzle & that can affect accuracy.
Unless you really need it shorter, you might reconsider that, or get it to a professional, if there's one where you are.
How do you plan to re-attach the front sight?
Not knowing the caliber or what you want to hunt, impossible to tell you how far you "should" cut it down.
Denis
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