Today I took my MD-20 drum out for the first time just to function-check it.
I had an assortment of Fed bulk, Winchester bulk, and some Winchester high brass slugs.
I cleared through 50 federal low brass with no malfunctions, then I decided to switch to the slugs.
I switched the stock gas plug from 2 to 1, then fired 15 slugs, no malfunctions.
I loaded up my drum with Winchester low brass bulk and ran 50 more rounds before I realized that the gas setting was still on 1.
No malfunctions of any kind. Round count after today is 500-ish and I haven't had the gun fail yet.