.223 vs 5.56 go no gauges?

[Mike14_07]

Bought some .223 go/no gauges, but the no go shuts on a 5.56 chamber. Gonna order some 5.56 gauges but all i can find is 5.56 no go gauge and a field gauge. So is the go gauge the same?

[titsonritz]

Unless you are making barrels all you need is a 5.56 field gauge

[Mike14_07]

Unless you are making barrels all you need is a 5.56 field gauge

K ill order one now. let me ask you this, i removed the ejector and the extractor from the bolt. If i just put the bolt in the carrier, it will close on the go gauge. If i put the cam pin in and firing pin to hold it, the bolt wont cam into place?

[Iraqgunz]

Using a .223 gage will give you an incorrect reading. This has been mentioned many times in the various threads on the topic. I would also recommend following the procedures outlined in TM 9-1005-319-23&P.

[Mike14_07]

Using a .223 gage will give you an incorrect reading. This has been mentioned many times in the various threads on the topic. I would also recommend following the procedures outlined in TM 9-1005-319-23&P.

I could see on the no go gauge but i would think the go gauge should work

[26 Inf]

Using a .223 gage will give you an incorrect reading. This has been mentioned many times in the various threads on the topic. I would also recommend following the procedures outlined in TM 9-1005-319-23&P.

A little off-topic - are you aware of any one currently selling the NSN field gage?

[Todd.K]

First off people need to stop talking about commercial gauges as GO and especially NO-GO. I want the HS number on a gauge. Commercial NO-GO gauges vary by manufacturer and are almost always designed by and for bolt action gunsmiths. The allowable HS for SAAMI, bolt gunsmiths, and a new M4/M16 are all slightly different.

If you are using a quality barrel follow the 23&P. If you want to understand the difference in HS numbers let me know and I'll dig it out of my notes.

[Iraqgunz]

No. And the only gage that I would trust (aside from the NSN), is the gage sold by Brownells under the name Colt Field II Gage as I recall.

A little off-topic - are you aware of any one currently selling the NSN field gage?

[26 Inf]

First off people need to stop talking about commercial gauges as GO and especially NO-GO. I want the HS number on a gauge. Commercial NO-GO gauges vary by manufacturer and are almost always designed by and for bolt action gunsmiths. The allowable HS for SAAMI, bolt gunsmiths, and a new M4/M16 are all slightly different.

If you are using a quality barrel follow the 23&P. If you want to understand the difference in HS numbers let me know and I'll dig it out of my notes.

TM 9-1005-319-23&P Change 4 page 3-47 and following ain't a wealth of information on dimensions. The .mil gage is also rimless so it says nothing about removing the ejector.

Here are the HS numbers:

Attachment 42986

If it closes on a Field II you probably ought to not use the rifle.

Brownell Tech Tip How to Gage: http://www.brownells.com/GunTech/Tec....htm?lid=16918

[26 Inf]

No. And the only gage that I would trust (aside from the NSN), is the gage sold by Brownells under the name Colt Field II Gage as I recall.

Got one of them. Thanks.