michael1778 Wrote:As promised, I have some measurements. I also have a correction. The barrel is a Shilen, not a Satern.
Gas port was measured two ways.
Method One: inserted a hex key into the port. The largest one that fits (and fits nicely, snug but I didn't have to force anything) is marked as 3/32 inch. That's 0.09375 inch, right?
Method Two: My friend got out his digital calipers and measured the inside of the gas port. He is using a small but flat pair of surfaces inside the circular gas port. He measured a few timers and got numbers from 0.074 to 0.078 inches.
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Thanks for your help.
3/32, 0.9375 is flat to flat, your diameter is vertex to vertex, which will be slightly bigger than the 3/32 measured. I need to break out my geometry brain but it is calculatable.
edit to add: using cos 30* (corrected to 30) for the internal angle, and 1/2 of flat-flat as the adjacent side, the diameter is 2*0.0541, or 0.108" diameter.
Of course some 3/32 hex keys are not exactly 3/32, could be a tweak smaller, so I would say best est of the diameter is 0.100".
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