Low luck is dangerous if you plan on getting shot. If you have MOS and bonehead, your head bypass chance is close to 0, even with 1 LK, but eyes shot will blind you like 1/2 crits, with 3 LK it drops to 1/3. But even with MOS, 1 LK leaves you very vulnerable to groin and arm bypass. But as a sneaker, you will be killed bypass or not if you get shot. You get hit by plasma nades, and pistol sneaks will kill you by damage rather than crit effects anyway.