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No such thing as a type 99 carbine unless you're calling the short rifle a carbine which is what I took him to mean. There is a type 99 long rifle which are reasonably uncommon. If it's an actual...

$100-$800. Need a lot more information and photos to narrow it down.

Is it original, no cuts, no missing parts?
Intact mum?
Matching serial numbers?
Rust?
Stock condition?
Anti-aircraft...