I have 4 Polytechs and 1 Norinco. Going on nearly 20 yrs since the first one.
Don't believe everything you read. [ including my post ]
Check your headspace and if it's GTG , shoot the SH$$T out of it. If it's "excessive" replace it. I have all the USGI parts to swap 3 of them out but can't wear out any original parts to justify doing it.
I did swap a commercial bolt in 1 of them that was just about to close on a NATO MAX gauge. I shot many a thousand rds thru it without any concerns or problems. Swapped it ...just because..
I also put 18" barrel on one, cause I wanted a Bush/scout version.
BTW... All I shoot is surplus ammo. Any and all I can find. " IF
".. TSHTF...ain't no going to the store to find your favorite match ammo. I don't reload 7.62 and not trying to turn my $400-$600 Polytechs into 1 moa rifles though they are all very accurate. I have a $500 bolt gun for that.
I have M14s and Fals because they are reliable MBR's and I treat them as such. [ multiple rapid mag dumps..etc...]
If and when the pressure from the forum gets to you to change out all that chinese junk,
,,,the best place to buy parts is right here in the marketplace
I'll be slammed shortly for the sacrilege..