My AR's are worth too much to risk their safety just to save a couple cents a round. My barrels are expensive and I don't want to replace them any earlier than I have to.
If you feed it crap the results you get will be crap. The rifles, pistols and ammo from China have no warranty, no customer service, and no quality control.
If I had a Norinco AR or one I paid less than $1000 for I might consider shooting Norinco ammo.
The cheapest ammo I'll shoot is American Eagle.
Well, I don't know about you, but I don't buy cheap ammo intending to shoot it thru' and expensive barrel. Nor buy and expensive barrel to shoot plain ball ammo.
My AR's are worth more than most. More than anyone else I know personally.
It's funny tho, my one upgraded to the nine, everything EXCEPT the barrel.
I'll buy the cheapest barrel for that rifle, usually used.
Shoot Norc thru' it, ussually for short range speed, where MOA accuracy doesn't matter.
Shoot until it melts, replace, repeat.
I go out of my way to fine tune the action, make sure it's running like a sewing machine, never have any strange problems I can't explain without the ammo.
Actually, there is one problem I've had with Norc. Specicially Lot 95/31.
BEcause the bullet is slightly undersized, I ended up having to drop a barrel a bit early cause it wore to the point that it can no longer stabalize Norc, but will still work ok with other ammo.
Funny story, lost $5 bet at the range one day, cause that was the day that barrel decided it was done with Norc.