03-05-2021, 02:37 AM
Red*Lion Wrote:I have only used a field gauge on AR's. As long as that does not chamber, all good.
I would wager there are more tight chambers found than over sized. When barrel manufacturers re-sharpen chamber reamers, "they will some times re-sharpen them too many times" creating an undersized chamber. AR bolts also vary in size, which is why it is important to chamber gauge with the bolt that is being used. The short chamber barrel I have was not a cheep barrel from a manufacturer of questionable reputation. This barrel failed with an extension head space gauge" which is precisely ground to spec, taking the differences in bolt size out of the equation. The barrel did barely pass with a smaller sized bolt I had in inventory..Klem's method can work fine, but sometimes gauges are the best tools to prevent any future problems, if one has access to them. The field gauge will determine if the chamber is too long and is un-safe. The no go gauge is a good gauge to have if one wishes to get the most life out of their brass for reloading....