Has anyone done a test on M14s receivers,bolts and barrels to see what the hardness measures are on the Rockwell C scale? I know that when Century Arms was assembling guns these parts were in the Springfield Armory M1a range. All of the usa information deals with pre-clinton era guns and not the canadian imported guns. I haven't had any problems with my M14s rifles, which have shot many thousands of norinco and czech 308 shells. All I ever did was replace the op rod spring to us gi and put it in us issue stock.