So update-ish. I broke out the 19MOS/Comp after class today. Put 19 rounds of 147gr JHP through as fast as I could pull the trigger with no malfunctions. Then someone gave me some 124gr Alum. blazer to try. 17 rounds with no malfunctions. I hadn't changed the spring or anything. Hoping to pick up a case of 124s this week to try out and see what happens.