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1/22/2020 12:12:56 PM
Posted: 7/21/2008 3:21:12 PM EST
Looking to make my own custom gas block. Adjustable port would be nice. Anyone have any insights or tricks?
Link Posted: 7/21/2008 7:02:09 PM EST
Insights? nope. Not much to them. Pretty basic machine work. The only appeal to the factory blocks are the fancy contours. I'll never buy one again.

I made one from 11L44 barstock and a couple from raw forgings I bought from Garrison a few years ago, and they work.

I made the 1144 about 0.003" oversize on the barrel by accident, but with the setscrew underneath and opposite the gas port I see almost NO gas leakage. I probably could have made the barrel hole even larger.

The "adjustable port" is just a pointy set screw inline with the gas port hole to restrict flow, inbetween the barrel and the gastube.

Next time I am home I will drill that barstock gas block for a setscrew and drill out the barrel gas port from 0.071 to maybe .093 (300 whisper build, pistol port gas location). I think I will add in a nylon faced setscrew at right angles to add drag to the "throttle" setscrew.
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