Gas Port Data

[Col_Crocs]

They still are, I believe. That being said, .080 is still far too large for a 14.5mid. It'd be unfortunate if this is the direction they're taking. I've always liked their barrels and I believed them to be one of the go-to's for the conservative gassing, which is rare these days.

[Iraqgunz]

If I was using a 14.5" mid (I actually have one I just don't use it) from Sabre Defense I would prefer that larger port. I have seen several 14.5" mids start to choke when you mess with the gas.

They still are, I believe. That being said, .080 is still far too large for a 14.5mid. It'd be unfortunate if this is the direction they're taking. I've always liked their barrels and I believed them to be one of the go-to's for the conservative gassing, which is rare these days.

[Col_Crocs]

All the way up to .080? Interesting. I always thought the common .078 was sufficient and anything beyond that was too much. When talking about a 16mid, what would you say is the ideal size?

[Kdubya]

How dare you speak ill of The Chart.

Lol. No heresy. Quite the contrary. I actually hang out at the airport on weekends handing out copies of "The Chart" to travelers. It's mostly a thankless endeavor. But every so often, I get to see that TDP glimmer suddenly illuminate in some lost soul's eyes; and life has meaning again.

[MistWolf]

Numbered drill bits ok enough, but I'm worried about regular drill bits, one not fitting, the other loose, and the "measurer" splitting the difference

Numbered drill bits ARE regular drill bits. Whether the port is measured with drill bits or pin gauges it's done by finding the largest one that fits and the smallest one that doesn't and guestimating the size according to how much wiggle there is

[P2000]

Numbered drill bits ARE regular drill bits. Whether the port is measured with drill bits or pin gauges it's done by finding the largest one that fits and the smallest one that doesn't and guestimating the size according to how much wiggle there is

By regular I was referring to a basic $12 set that your average Joe would have in their toolbox. 5/64", 3/32",1/8", ect. Not the box of number drills where there are 50 different ones in a box, by number, each being very, very slightly larger than the next.

The difference not being the drill itself, but the set....as in how close in diameter one drill is to the next size.

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[Iraqgunz]

I use a .061-.250 +/- pin gage set for measurements.

Numbered drill bits ARE regular drill bits. Whether the port is measured with drill bits or pin gauges it's done by finding the largest one that fits and the smallest one that doesn't and guestimating the size according to how much wiggle there is

[SkipD]

If one uses drill bits or any other common tool to measure a hole size, I would suggest measuring the bit or tool with a good micrometer to verify the diameter.

[Muzap]

If one uses drill bits or any other common tool to measure a hole size, I would suggest measuring the bit or tool with a good micrometer to verify the diameter.

Exactly. Preferably a calibrated micrometer. Pin gauges can't be calibrated, they're just convenient because they step up in .001 increments. You could use any well-machined metal rod as long as you are able to confirm it with a calibrated micrometer.

[MistWolf]

I use a .061-.250 +/- pin gage set for measurements.

I'd like to get a set of pin gauges. If I keep building FALs, it'll need to go to about .275. With the smaller consistent steps, a pin gauge set will give much more precise measurements than a drill index

Pin gauges can't be calibrated, they're just convenient because they step up in .001 increments. You could use any well-machined metal rod as long as you are able to confirm it with a calibrated micrometer.

Yes, pin gauges can and should be calibrated. They can be sent out to a metrology lab or the user can verify diameter with a calibrated mic, caliper or go/nogo gauge. The metrology lab can also ensure the pin gauges are round and parallel