O Ring in a CP on/off?

[Robin Hood]

I just took a CP on/off off a gun and there was an o-ring wedged in one of the holes between the brass inside and outer body. I pulled it out.
Should that have been inside or did it randomly just end up wedged in there?

 

[A1-BOY]

if it works with the oring, leave it in.

 

[Robin Hood]

It wasn't supposed to be there. Sorted now.