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I have no experience with sub-carbine length gas systems, but that certainly won't work. What's the barrel?
What barrel is this?
Pistol length gas?
i got the upper from a friend and was told it is a 7.5 inch barrel and the gas tube is 7 inches.
Not sure of barrel brand or length but its a 7 inch pistol tube but its supposed to be 7.5
Gents I removed the barrel to find that it's an 8 inch barrel but now I'm not sure what length tube I need.
The 8" barrel will use a pistol-length tube which is typically close to 4.5".
Please measure the barrel and report back.
Try to use calipers and be as accurate as possible.
This drawing is correct.
Note: there are at least two different "pistol" lengths.
http://vtsupply.com/images/gassystemlength.jpg
So from gas port to extension?