If the 9mm version is anything like the 40, those things are tighter than a bug's butt. When you get it wipe the factory grease off and lube it up to dripping. They like to be run pretty damp. Mine is also really sensitive to
limp wristing, but that might be the .40 caliber coming into play. If my wrist isn't perfectly stable, I'll get a failure to feed every time. Once I figured that out, ...