I've had my S 12 for almost a year, and I still can't get it to cycle cheap bulk low brass. I've tried everything I could find out. I bought a gunfixers gas plug, a reduced power recoil spring, I've polished the bolt, carrier, and hammer, I enlarged the 3 gas ports from 5/64 to 3/32, and several other minor adjustments.
I guess my question is, am I missing anything that would help, or do I need to just bite the bullet and shoot lots of high brass to break it in?
Any help at all would be greatly appreciated.