Idaho is a gun state for the most part. Many Idahoans own firearms.
Do you know that it is a federal crime to possess a firearm if you are prohibited from possessing one? Under federal law there are a number of factors that can make a person "prohibited." One factor is engaging in violence with someone you date or cohabit with. Another is being convicted of a felony and not having your rights restored.
You can also be considered a prohibited person if you use a controlled substance identified as such under federal law. So, if you are a user of marijuana you can be considered a prohibited person, disqualified from owning or possessing firearms.
You should also be careful if you alter the gun in any way. Some people like smaller shotguns and rifles. So, they saw off the barrel. The problem is they might not measure the barrel correctly so they end up with a firearm that needs to be registered with the National Firearm Registry. For example, if you have a shotgun with a barrel length of less than 18 inches it needs to be registered. Otherwise, you are looking at a possible federal prosecution and 10 years in prison.
If you do saw off a barrel make sure to measure it correctly. Use a dowel rod pushed down to a closed breach and measure it carefully.