Roll pin for gas block to hold gas tube

Joined
Mar 3, 2016
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So I was tearing my mp10 apart to have the barrel threaded...

No pin in the gas block holding the tube to it...
Isn't there supposed to be one in there?

Maybe this could be a reason people have cycling problems???

Anyways, I have to find the pin... Where can I buy this part or is it a standard part on all ar's?
 
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