Geez. I had the same experience as the OP. Fired at a zombie from a reasonable distance(across a standard house yard, it had not seen me). I was not expecting a kill, just testing how much attention it attracted. I was crouched half behind a bush. The zombie IMMEDIATELY aggroed on me, as well as 3-4 more from the general vicinity. That, coupled with the fact that one shot will not kill them, makes the MKII COMPLETELY useless, and it may as well be removed from the game. I had the same issue with other suppressed weapons. A suppressed FX45 attracted zombies from all over the area. At me, not "the area of the bullet impact", which seems a ridiculous concept. I can throw an item next to a zombie and it turns, but doesn't aggro