A Rifle is an item that can be found in the Mountain Biome.
A Rifle can be found in a Storage Container at the Mountain Camp. The sixth letter you receive depicts a mountain cave. If you travel up into the snowy part of the mountain, and go slightly to the right, eventually a house marker will pop up where the cave is located. There you will find a storage container holding the rifle, the final letter, and a fire pit.
A Rifle can be used to hunt Big or Small game. The Rifle is the only weapon that can kill a Grizzly Bear.
Rifle can only be used if a Bullet is in the inventory.