As I said, my two M14s, plus well over 40 that I have personally put a Nato NO GO gauge into have swallowed the Nato NO GO Gauge. You can argue that all you like but that isn't going to change that fact. As for your comment of uneducated/inexperienced advice, I would be careful with throwing that one around. My gunsmith, American trained and has been working on Garands and M14s for over 30 years, another gunsmith of mine who was trained to work on AR-15/M-16, M-14/M1A and 1911's by an Ex Marine Corps Armorer with 35 plus years behind AR-15/M-16, M-14/M1A and 1911's, and a number of other Military armorers and such interesting people that have been playing with and running these guns for long than I have been around.
My comments were about the chamber, not about how good or bad these rifles shoot. I can personally vouch for these Chinese M14s shooting very well. The original sights leave some to be desired in that they aren't up to part with American/Italian machining, but if you set the Sights and leave them alone, they are perfect. It is only the mechanical part that is the issue. My two personal M305s had barrels that were under machined and left sitting towards the 1 o'clock position. in to the barrel vice, shave a bit off the shoulder, and they both are now centered with everything working smoother now. The Op Rod spring was changed to that of GI OpRod Spring, the bearing surfaces were polished the flash hiders were replaced with that of the correct GI Flash hider with bayonet lug, the ferrules were de-burred and polished to allow proper movement under recoil and allow everything to reset to the same point every time. I might even go as far as glass bedding a over sided Walnut M1A stock.
That all said, if you are who I think you are 45ACPKING, I have talk to you in person before about buying one of your worked over M14s.