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Gunsmithing Mid-length gas dimentions

Re: Mid-length gas dimentions

Front or back end of bbl extension?

From the front of the extension to the gas block shoulder is 7-1/4".

From the rear of the extension to the gas block shoulder is 7-7/8"

Gas tube is 9-3/4" OAL
 
Re: Mid-length gas dimentions

I just measured it again to make sure.

7-7/8"

This is from the gas block shoulder to the rear-most edge of the bbl extension (where the feed ramps begin).