You can, of course, put your item(s) into an auction and so avoid all this risk business. Especially as it is now not easy to post pcp rifles.
Cons: the seller fees, maybe 20% and maybe a minimum charge, and transport to the auction house. Maybe get back less than you want.
Pros: Easy sell, no hassle posting or dealing with a (possible) buyer. Maybe, if the wind is in the right direction, you will get more than you expect.

Cheers, Phil