Week 3 of Modern Warfare 3 Season 3 is now live and as per usual, there are brand new Weekly challenges up for players to complete. One of those will have you use your gun in a very primitive but very effective way – and may even get you to chuckle a bit. Here is how to get Gun-But kills in Modern Warfare 3.Modern Warfare 3: How to get Gun-Butt KillsIf you plan on getting the Week 3 Aftermarket part – the JAK Cutthroat -, then going for the Gun-But kills is probably a good idea given how simple it is. You see, Gun-Butt kills are performed by defeating and killing enemy Operators by using the Gun-Butt of your weapons, making them melee kills in essence. So, as long as you equip any Recommended Weapon, then you should be good to go, right? Well, not quite.Screenshot: PC InvasionYou see, if you happen to have the Throwing Knife equipped as your Lethal Equipment, your character will instead use said knife to perform melee kills. These won’t count toward th…