How to sell a Short Barreled Shotgun (SBS)?

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The original was posted on /r/nfa by /u/TomBonner1 on 2023-06-27 16:11:43+00:00.

I bought a Remington 870 Police Magnum sbs (14" barrel) in February 2021. The transfer was done via a paper form 4. My $200 was taken out in May 2021, and I finally got my stamp/was able to take possession of the sbs in May 2022.

I'm thinking about selling this 870 now. How difficult is it as an individual to sell a short barreled shotgun?