Pin Gage Set to Measure GPs

[OldState]

Is there a reasonable option for a set like this in the sizes needed to measure gas ports? All I see are massive sets with 90% of the set too small or big for this application. Doesn’t someone make one just for this application? Any ideas or advice? Thanks!

[Inkslinger]

https://www.meyergage.com/products/i...ual-gage-pins/

[gunnerblue]

Black River Tactical recently recommended using drill bit as an accurate way to measure gas ports. Of course, there are probably less options as opposed to dedicated gauges.

[DFSgunner]

Black River Tactical recently recommended using drill bit as an accurate way to measure gas ports. Of course, there are probably less options as opposed to dedicated gauges.

This^, been doing it for years

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[26 Inf]

EDIT - Sorry I lost track of what you wanted.

Just google: '.073 pin gage' substituting the number you want.

I have this set of pin gauges ($49.95):

https://www.amazon.com/HFS-0-061-0-2...gateway&sr=8-3

These sound better from the description ($69.00):

0.061''-0.250'' x 190 Pcs, size electro etched on each piece
Overall length 2'', all members 2'' long, centerless lapped
Finish: Each gauge has a 10 micro finish or better
Hardness: Heat treated 60-62 RC
Tolerance: All gauges with .0002'' limit, plus or minus

https://www.amazon.com/Accusize-Tool...ateway&sr=8-13

The wire drill bits might be accurate, but there are 13 different dimensions to measure (if you want to hit them all) and those drills bits would likely cost you more than the pin set.

Trigger pin holes ought to be .155, here you go ($2.75):

https://megadepot.com/product/vermon...SABEgJmlPD_BwE

Just google '.155 pin gage' substitute the size you want and go from there.

Class ZZ Gages - These gages have an inch tolerance of .0002” and a metric tolerance of .005mm. They are practical where good precision and speed are important.

[markm]

I just run a big sewing needle. It's tapered. I insert the needle and use calipers to measer the needle where it stops in the port. Good enough to get me within .001"

[titsonritz]

Is there a reasonable option for a set like this in the sizes needed to measure gas ports? All I see are massive sets with 90% of the set too small or big for this application. Doesn’t someone make one just for this application? Any ideas or advice? Thanks!

This is the set I bought...

http://www.starrett.com/metrology/pr...ages/S4003-250

The first three rows has the size range for gas port measuring. When I was first shopping around for a set I tried to find a quality set with just that range and gave up. After buying this set I've found I use the larger pins more often for other tasks than I do measuring gas ports. That said every barrel I touch gets a stick down the hole, in fact, I broke it out just a few weeks ago at one IG's armorer courses.

[prepare]

This is the set I bought...

http://www.starrett.com/metrology/pr...ages/S4003-250

The first three rows has the size range for gas port measuring. When I was first shopping around for a set I tried to find a quality set with just that range and gave up. After buying this set I've found I use the larger pins more often for other tasks than I do measuring gas ports. That said every barrel I touch gets a stick down the hole, in fact, I broke it out just a few weeks ago at one IG's armorer courses.

Do you have a link to IG's armorer courses?

[titsonritz]

Do you have a link to IG's armorer courses?

He posts them all the time here...https://www.m4carbine.net/forumdispl...ents-amp-AAR-s

[OldState]

I just run a big sewing needle. It's tapered. I insert the needle and use calipers to measer the needle where it stops in the port. Good enough to get me within .001"

That’s a great idea. I will try that while exploring some of these options

This is the set I bought...

http://www.starrett.com/metrology/pr...ages/S4003-250

The first three rows has the size range for gas port measuring. When I was first shopping around for a set I tried to find a quality set with just that range and gave up. After buying this set I've found I use the larger pins more often for other tasks than I do measuring gas ports. That said every barrel I touch gets a stick down the hole, in fact, I broke it out just a few weeks ago at one IG's armorer courses.

What did you mean by “first three lines”?



I got excited about the Megadepot site until I saw the $100 minimum.....