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Discussion Starter #1 (Edited)
First, let me say there probably is a proper name for this but I didn't take the time to look it up,I was having an issue of it coming loose during firing but didn't want to have to tighten it enough that it would require tools (pliers) to remove it. I found that a #6 o ring works great. The plus side is that you don't have to remove it for dis assembly. It does require some wiggling but the barrel will come out of the gun with this installed. Sorry if this had already been remedied but it was posted as an issue once before when I was on here.
P.S. The dimensions on a #6 are 7/16" O.D. X 5/16" I.D. X 1/16" diameter.
 
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