I'm gonna have to call BS on the lawyer you talked to.
https://www.justice.gov/sites/default/files/usao-ut/legacy/2013/06/03/guncard.pdf
https://www.richardhornsby.com/federal/crimes/felon-in-possession-of-firearm.html#:~:text=Under federal law, the crime,release, and $250,000 in fines.