You have to go to mission select and select a mission. When your on the mission screen to see what animal you are going to hunt hit c. After you hit c pictures of guns with their name on it will pop up. If you have unlocked guns you will see arrows hit them to see all your guns. Pick your gun and that gun will replace your other. Such as if you pick the muzzleloader to go and hunt you will not have your Remington on the mission you changed your weapons. Now this is the thing once you change your weapon you will have that weapon until you change it again. Example if I change my Remington to a Muzzleloader in the 6 mission it will stay like that until I change it so it will be a Muzzleloader in missions to follow if I don't change it. I hope this helped you! Live Laugh Love=Good Times

Starting with the first level, you have to earn a medal for every hunt. Once you have a medal for every hunt, when a weapon is unlocked, you cannot use it until the beginning of the next level. To use it, you have to select it at the beginning of the level with the "Y" button for Xbox 360. Buttom line up front, for every hunt, you have to earn a medal. Hope this helps.