Is value determined by an import, or lack of import, mark? Some say yes, some say it adds to the history of the weapon, some say no.
In general an import mark usually detracts value. Harsh deep stampings, as in the Blue Sky take a beating. The lighter or hidden under the stock markings, not so much.
Look at what else the carbine has to offer. Condition, condition, condition. Maker, what is the finish like, is the stock desirable. Early or later parts. Part markings, maybe a rare or hard to find part.
If I add up what the parts are worth, and feel I can sell them for more then the asking price, I feel the carbine is worth considering.
Have I bought a carbine that was over priced just to get a stock or a few nice parts, yeah sure. Have I bought an import marked carbine and changed the barrel, yeah I have. Have I paid more then a single part was worth because I wanted/needed it, you bet.
Bottom line for me, there are more things to consider then just an import mark.