Glad your’s runs smooth. I built mine at Q last spring. If I knew for certain the KAC mag would solve the problem I would gladly buy 2. But I don’t want to drop that much on mags to have the same problem. 2 P mags and 2 L7 mags and they all do the same thing.
For what little I ran mine with the P-mag it did fine, I switched to the KAC so I could increase my c.o.a.l a little.