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Brownell's sells the TE guage. $62.50US. They don't list a muzzle wear or a bore guage. You don't really need any guages for most rifles. Takes a great deal of shooting to wear a barrel. The only rifle you'd need to know the ID of the barrel on is a Lee-Enfield.
Okay then thanks I am starting a collection of M1-Garand's right now. I know thease rifles have been shot alot (or some of them). Right now I am starting with International Harvester built rifles.