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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
go-no go-field gauge??
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<blockquote data-quote="msalm" data-source="post: 821363" data-attributes="member: 8863"><p>If sticking with standard components (5.56), there's a very good chance you don't need to worry about it. If you want to check just to be sure take out the ejector from your bolt and install a new unloaded case in the barrel and see how much play you have. You can add a layer of tape or two and see if it will still chamber. New brass is .002 to .004 thou under a 'go' gage (on average) so take that into consideration. This is just a feel good step to see if things are 'close', and not a for sure 'it's spot on'. Again, with the specs that are out there I probably wouldn't have any hesitation in just throwing a bolt in and shooting it and seeing how the cases looked. Only way to really know is with a standard go and no-go gage. The field gage is another .004 larger than the no-go.</p><p> </p><p>If you have a depth mic, before you install your barrel slip an empty case into the chamber and use a depth mic to measure from the end of the extension to the case head. Your measurement should be around .370" + or - . If your in that ballpark things are probably good. If you're more than .007" off (to the greater than) things are not right and I'd check with gages.</p></blockquote><p></p>
[QUOTE="msalm, post: 821363, member: 8863"] If sticking with standard components (5.56), there's a very good chance you don't need to worry about it. If you want to check just to be sure take out the ejector from your bolt and install a new unloaded case in the barrel and see how much play you have. You can add a layer of tape or two and see if it will still chamber. New brass is .002 to .004 thou under a 'go' gage (on average) so take that into consideration. This is just a feel good step to see if things are 'close', and not a for sure 'it's spot on'. Again, with the specs that are out there I probably wouldn't have any hesitation in just throwing a bolt in and shooting it and seeing how the cases looked. Only way to really know is with a standard go and no-go gage. The field gage is another .004 larger than the no-go. If you have a depth mic, before you install your barrel slip an empty case into the chamber and use a depth mic to measure from the end of the extension to the case head. Your measurement should be around .370" + or - . If your in that ballpark things are probably good. If you're more than .007" off (to the greater than) things are not right and I'd check with gages. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
go-no go-field gauge??
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