I just did some work for an M14 lover. What was really interesting was it's markings. Lever Arms was the 'importer' and M305 was on the receiver. "7.62" was stamped but no units... Being a high school science teacher, I was alarmed but I had to force myself (down from Condition Red) to breathe and return to Condition White, and relax. There was nothing to worry about. I still wrote my observations in red pen, a usual practice while marking tests, essays, reports, homework, etc. 
So here is what I found:
Rear sights:
Hey, it took the Zhinese Kommunists 10 years but they finally got it right. Repeatability and correct tension. The owner did not change/upgrade the sights. So they moved and felt like real USGI M1 Garand sights. Made nice audible kliks on both adjustment directions.
Op Rod guide:
Teeny bit of sideways slop, but I knocked out the existing thin walled pin and sure enough it was split and cracked. I replaced it after peening the owner's barrel. Then I re-installed the op rod guide. Nice and tight now.
Gas Cylinder lock:
Tight to 6 o'clock and moved to 7 and then 8 with lots of effort. Only one shim , I assessed. I 180'ed the gas cylinder lock and it tightened up at 1100 hrs, too far. Back to the 1 shim assessment. I was right. The lock is tight at 4 o'clock and I had to crank on my Sadlak Gas Cylinder wrench really tightly. Good to go.
Flash suppressor:
ONLY 4 gentle whacks and it came off ....
I replaced with USGI M1A dimensioned American flash suppressor. Now this barreled receiver pings without even racking the bolt. Nice machining but typical Norc rough high school shop class texture. The owner requested a replacement FS.
Indexing:
Holy Fzck, Batman.... it's dead nuts on with my parallels and my American (known quality) M1A flash suppressor. I'm leaving it alone.
Conclusion:
I offered to buy it from him....
I'm at an Oshawa, ON M14 Clinic tomorrow, we are gonna have fun working on these rifles once again! For those of you sitting on the fence, you know what I'm gonna recommend; don't buy ONE! Buy TWO of them!
Enjoy the addiction. Hope to see ya M14 lovers at my next clinic near ya!
Cheers,
Barney
So here is what I found:
Rear sights:
Hey, it took the Zhinese Kommunists 10 years but they finally got it right. Repeatability and correct tension. The owner did not change/upgrade the sights. So they moved and felt like real USGI M1 Garand sights. Made nice audible kliks on both adjustment directions.
Op Rod guide:
Teeny bit of sideways slop, but I knocked out the existing thin walled pin and sure enough it was split and cracked. I replaced it after peening the owner's barrel. Then I re-installed the op rod guide. Nice and tight now.
Gas Cylinder lock:
Tight to 6 o'clock and moved to 7 and then 8 with lots of effort. Only one shim , I assessed. I 180'ed the gas cylinder lock and it tightened up at 1100 hrs, too far. Back to the 1 shim assessment. I was right. The lock is tight at 4 o'clock and I had to crank on my Sadlak Gas Cylinder wrench really tightly. Good to go.
Flash suppressor:
ONLY 4 gentle whacks and it came off ....
I replaced with USGI M1A dimensioned American flash suppressor. Now this barreled receiver pings without even racking the bolt. Nice machining but typical Norc rough high school shop class texture. The owner requested a replacement FS.
Indexing:
Holy Fzck, Batman.... it's dead nuts on with my parallels and my American (known quality) M1A flash suppressor. I'm leaving it alone.
Conclusion:
I offered to buy it from him....

I'm at an Oshawa, ON M14 Clinic tomorrow, we are gonna have fun working on these rifles once again! For those of you sitting on the fence, you know what I'm gonna recommend; don't buy ONE! Buy TWO of them!
Enjoy the addiction. Hope to see ya M14 lovers at my next clinic near ya!

Cheers,
Barney