Samocoptor

But I'm incapable of shooting. The first two servers I've been on (got DayZ today) have had starter kits and on both I've started with a gun, with ammo and everything. Yet when I press the button I have assigned shooting two (left mouse button) I don't shoot. I've tried reloading, un-equipping and re-equipping it, aiming down sights, everything. I've even changed my key binding for it. Why can't I shoot?