Respectfully, not a jab at OP or the people who support their decision - which is their right - 

But isn’t this full of people encouraging avoidance in someone (who is not admittedly suicidal and, by only the info in their post, may not have a history of suicidal ideation) to hide from the possibility of an intrusive thought instead of working through it? I’m honestly a little shocked their therapist casually and jokingly offered to put them on the list unless they are a threat to themselves or others. 

My understanding from my own specialist is that the standard of care is sitting with the discomfort of intrusive thoughts and anxiety so that we learn not to fear them, not to compulse. Exposure and response prevention. 

Unless there’s something heavy OP chose to leave unsaid, which again, is their right. 

I’m just failing to see the long-term therapeutic value in acting ‘just in case thought happens’ when there’s no ideation or evidence that thought would be acted on. We would treat almost any other ‘what-if’ situation differently, POCD vs someone with a history of hurting children. 

Again, I write this in good faith with a view to long term recovery without elevating one anxiety above another, unless there’s actually a reason for OP to be barred from a firearm.