here is rest of the stumper-check out the cam cut that some bubba gunsmith evidently did. My hunch is the thing was not cycling the best with the gas relief it was getting and bubba gunsmith spotted the heart shaped cut at top and thought was machining error?????? I have fired 30 rds thru it and its fires and works smooth as silk but is dirty gun to shoot, kinda like shooting russian ammo shooting LC or shooting a M2 full auto. Does anyone know any other reason it would have a cut like this??