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Forgot to mention with the AR stripped and thoroughly cleaned, when at the range testing with one round in the mag per HOW CTS recommendation, I decided to test multiple rounds again with Tula. This time, the failures also happened with the Tula 223 rounds the same way as it did before with the PMC.
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What failures are you having? Is the bolt not locking back after the last round each time?
I always suggest eliminating a few factors when people have issues with their AR15 by using reliable magazines and ammo:
First, use reliable mags like Pmags. So if you know your mags (pmag/gi) is working fine, then its not a mag issue.
Second, use the same ammo for each test, starting with factory brass ammo only and see if you are still having the issues.
If you know your mags and ammo are good and not the source of the problem, then you can start isolating the gun. In your case it might be the buffer you are using. If its too heavy of a buffer, that will cause it to short stroke and not lock back/feed the next round.
Using the method CTS described (1 round in mag test), is the rifle locking back after the shot or not?
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Try this:
use standard 5.56NATO ammo only, preferrably Federal M193 or M855 with Pmags. Do the one round test a few times to see if its locking back after the last round.
If it is not, then your rifle is definitely short stroking.