Where does this part go? Stumped.

[Mccarlson]

While cleaning my Mossberg 930 tactical for the first time yesterday, this rubber washer fell out and into my hand after removing the trigger assembly. I can not figure out where it came from. Where does it go back to? Here is a picture.
https://www.dropbox.com/s/1ud3qa946m44nvq/2016-06-28 02.24.22.jpg?dl=0

 

[Pawpaw]

I can't see your pic. The page wants me to log in.

 

[Rob72]

That is really an excellent question! If I had to guess, I'd say it sits between your trigger housing and the receiver, held in place by one of the trigger pins. Quite a few folks have complained about side-to-side movement, and that would be a non-manufacturing solution to the issue. I don't have that part, nor is it shown in the parts diagram, so...

 

[MikeD]

You will need to post your pic as view-able to public of post it to a site that allows that or just upload it this site.

I am not sure offhand what the part may be as I have not noticed any rubber washers while stripping my mine.

 

[Green Sub]

Here you go for the OP