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1/25/2018 7:38:29 AM
Posted: 3/26/2002 10:55:25 PM EST
Can someone tell me what 5.56 NATO Go, No-go, and field gauges are supposed to measure? NOT what the .223 Remington gauges are supposed to measure.

Link Posted: 3/27/2002 2:45:44 AM EST
Help you know whether or not your rifle is within acceptable headspace specs and that the B/C installed is compatible (in spec) with upper it's installed in. If I purchase an upper at gunshow and it did not come w/ a B/C installed from factory I always make dealer do a go/no-go check before I pay my money as I want a dedicated B/C for every upper I own (personal preference). That said there are some here that use the same B/C for several uppers, but suspect that they know via guages that their in spec.

Generally speaking a new B/C and a new upper SHOULD be a compatible match, guaging provides the peace of mind that indeed no headspace problems exist.

Hope this helps, my take on you question,
Link Posted: 3/27/2002 6:47:47 AM EST
The answer to your question is tacked at the top of the Maintenance and Cleaning forum.
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