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9/22/2017 12:11:25 AM
Posted: 8/21/2005 6:45:18 AM EDT
Here is the thread from a previous post about headspace gages.
Headspace gauges in 5.56mm: bolt dissassembly?

I cannot find rebated rim 5.56mm GO and NO GO gages, anywhere on the Internet.

I want to experiment with making a rebated rim 5.56mm GO and NO GO gages, so that headspace can be checked without having to disassemble the bolt, like the USGI FIELD gage allows. I need a machinist who can put these gages in a lathe to rebate the rim.

I can include an extra GO and NO GO 5.56mm gages for the work involved.

I am thinking of one of the following gages from Brownells. I prefer the Forster (bottom photo), because dealer cost is half as much as the Clymer. Brownells does not show a dealer discount for Clymer. I use Forster for my Garand and M1A builds without issue.




If anyone is interested in this, let me know.
Link Posted: 8/21/2005 6:51:07 AM EDT
[Last Edit: 8/21/2005 6:51:55 AM EDT by j3_]
A go gauge with a rebated rim may cause false readings. The bolt face may not be flat or perpendicular to the chamber. I have a bolt now that the face is two different levels across it.
Link Posted: 8/21/2005 1:52:06 PM EDT
Why the need for the extra gages, when all the military uses is the field?
Link Posted: 8/21/2005 6:11:24 PM EDT
Military uses GO and NO GO gages, though not as extensively as the FIELD gage.
Link Posted: 8/21/2005 7:57:04 PM EDT
[Last Edit: 8/21/2005 7:58:17 PM EDT by eklikwhoa]
imo the field gauge would get you by but the others would make sure of it.

but if you really wanted to do it i would either contact steve@adcofirearms or the mad machinist mongo
Link Posted: 8/21/2005 9:29:05 PM EDT
The military uses guages with rebated rims. I'm sure there are some floating around for sale.
Link Posted: 8/21/2005 9:51:36 PM EDT

Originally Posted By BradH:
The military uses guages with rebated rims. I'm sure there are some floating around for sale.





think youre referring to the field gauges
Link Posted: 8/22/2005 4:48:27 AM EDT
The way I go it is that there is only a USGI field gauge because that is all the military needs. The military is not in the business of building firearms so they don't need GO/NO-GO gauges.
Link Posted: 8/23/2005 11:45:53 AM EDT
[Last Edit: 8/23/2005 6:56:33 PM EDT by AtlantaFireman]
It is in the works. I will post when done.
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