Suppressors Selling commercial suppressor accessories used

This is a general question, not a for sale ad. I understand the rules here.

Can an individual sell a commercial suppressor accessory secondhand if it is something that doesn't work or fit on their can?
How did you get it if it doesn't fit on your can? That may be a clue as to being able to resell it. I have seen endcaps that you can buy straight away just like buying a rifle sling so I doubt that it is illegal to resell or purchase one.
 
Will they take it back? Other wise just list it for sale there are a lot of Silencerco owners out there that may be interested. Then I would contact one of the suppressor builders here and see if they can supply the part you need.
 
the short answer is no i can't return it. there is a longer story that involves appropriate customer service and an offer on their part but it didn't really help me. i wanted to list it here but was concerned. hence the post.

in terms of getting the correct part, i've got an line in to the company i got my kit from and waiting to hear back about what my options are.
 
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