Aug 19, 2014 · The problem with using a no-go gauge to determine whether the headspace is ok is that no-go gauges will vary depending on what you want the headspace to be. Forster sells a 'match' headspace gauge set which has 11 gauges in .001" increments from 1.4636" to 1.4736".

Dec 26, 2020 · Take bolt out of bcg, remove ejector, verify go & no-go. (I do my testing before barrel gets into the upper, etc) Tip: the gauges should be good if you buy reputable set, but I always check go & no-go 2x, I rotate the gauge some arbitrary angle and test again. It's rare to find a chamber issue this way, but it can happen, etc.

Mar 28, 2017 · A go gauge measures 1.4636, a no-go is 1.4666. lets say the live round (that right there ought to be enough to tell you that this is not a good idea) that you happen to select falls right in the between, with a datum point of 1.4646 or 1.4656.

Apr 14, 2021 · The Go and No-go gauge leaves the end of the Bolt carrier flush with the back of the upper receiver. The field gauge leaves the bolt carrier sitting 3/16" flush of the receiver. The gauges are Forester for .223 and the barrel is 5.56.

Nov 2, 2005 · If the bolt "WON'T" close on the "No-Go" gauge, I consider the headspace to be good. If the bolt closes on the "No-Go" gauge, you can then proceed to check it with the "Field" gauge. However, for me the "No-Go" gauge is the limit, if …

Jan 16, 2018 · I don't own any headspace gages, but if I bought one it would be a "go-gage". You can add a layer of scotch tape to the base and you'll be close to a "no-go gage". .004" longer than a "go". I have quality gages I use for reloading and they serve the same purpose. Mo DeFina makes the best gage on the market, RCBS is excellent as well.

Jun 5, 2016 · The Go and No go gauges are the same because they measure chamber length from the case base to a index point on the shoulder, called the Datum line. There is no difference between case length in a .223, 5.56 or Wylde chamber so the gauges will work in any chamber.

Apr 10, 2006 · No, it did close on the Go-Gauge. It would not close on the No-Go and needless to say the field was a long way from closing. Mine are also Forster so I will check out their instructions. I was operation off of the build instructions in "the Ar-15 Complete Assembly Guide" by Walt Kuleck, Vol 2.

Apr 28, 2019 · The mil-spec No-go is set with the expectation the barrel will be able to fire a specified number of rounds before failing the Field gauge if the No-go gauge passes. Unless you have a match headspace gauge set you don’t know if it failed No-go by a little or a lot. As with everything else the bolt has tolerances.

Nov 21, 2014 · My current Forster 223 REM Go gage is 1.4636”. My current Forster 223 REM No-go gage is 1.4666”. My current Forster 223 REM Field gage is 1.4696”. The last time I looked SAAMI chamber spec for 223 REM was 1.4636” min to 1.4736” max. Mil-spec for 5.56mm rifles is 1.4646” min to 1.4706” No-go on a new barrel.