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