So a couple points. Firstly you do not have (or should not have) a AVT-40 as those would be prohibited in Canadaicon (the AVT-40 was the full auto variant of the SVT-40). Simple way to test if it is a AVT-40 is will the safety move to both sides of the stock. If it does do this, I recommend taking it to the police as otherwise it is a lengthy jail sentence.

Secondly it was very common during the refurbishment process after WWII to use AVT-40 stocks to refurbish SVT-40s whose stocks were in too poor condition for the standard. I personally have a SVT-40 with a AVT-40 stock and I prefer the thicker stock to the thinner SVT-40 stock.

As to value Sentryduty has a very good rough range. I will add that the bayonet tends to be worth 200-250$ alone. And in regards to your value in the US question, the answer is it is worthless there not because it doesn't have value, but it cannot be legally imported into the USAicon (unless the laws in the States change).