Can a non licensed business modify gun parts ?
I work for a company that cerakotes and hard anodize lowers and receivers. Is it against the law to provide these services on a cash basis without a permit or license ?
As long as the modifications don't make something legal, illegal, it is likely that the business can modify gun parts. However, should liability accrue, the fact the business is unlicensed can cause personal liability. This is an issue worth retaining counsel for to fully research on your behalf if you are concerned beyond legal conjecture.