Hmmm...I would have thought .001 of an inch would only affect accuracy.. and I have no doubt that it has happilly fired all manner of factory loads, which do vary between .223 and .224. Norma is .224, Winchester is .223. .......
As it is here IN NZ, I doubt it would be US manufacture........
Currently...Sako TRG 22, Model 29 .44 Magnum, Beretta M9 9mm, Beretta Neos, Colt AR 15 x 2, VQ 17 M2, Anchutze .22 hornet, the ultimate 10/22, LOTS of M1 Carbines.
"Beware of the Man with one gun...he probably isnt into guns enough to be safe with it".