What you described happened to some members within the OSW and 1:6 hobby retailers who sells 1:6 scale weapons (i.e. toys) on eBay due to how realistic some of them look where it appears they are 1:1 scale weapons.
Did your auction item clearly specify it is 1:6 scale and is not a 1:1 scale firearm, but a 1:6 scale miniature toy for use with say GI JOE figures, etc.?
You may want to check how some other auctions on eBay for loose 1:6 scale weapons are listed and adopt some best posting formats to avoid such issues.
Good luck.
Did your auction item clearly specify it is 1:6 scale and is not a 1:1 scale firearm, but a 1:6 scale miniature toy for use with say GI JOE figures, etc.?
You may want to check how some other auctions on eBay for loose 1:6 scale weapons are listed and adopt some best posting formats to avoid such issues.
Good luck.