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10/13/2016 12:21:09 AM EDT
Looking for info on overall LENGTH  of a gas block .... i was given a barrel that was shortend to 1/2 of an inch past the front sight  base... i have no idea why but it was a freebie...  a shorter gas block would allow for more length to thread
John


10/13/2016 1:04:35 PM EDT
[#1]
ours are .850, which is about as short as they come.



the gas tube protrudes another couple of thou past that




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