Defeat the game once on any difficulty.
Complete the required number of regions on any difficulty level to unlock these weapons:
.25-06 Bolt-Action-Complete 3 regions
.300 Magnum Bolt-Action and Hawkeye Scope-Complete 8 regions
.308 Bolt-Action and Field Scope-Complete 6 regions
.44 Magnum-Complete 1 region
12 Gague Semi-Automatic-Complete 5 regions
7mm Magnum Bolt-Action and Static Scope-Complete 4 regions
7mm Short Mag Bolt-Action-Complete 7 regions
Compound Bow-Complete 2 regions
Beat the game once. To use once you have it, press A after zooming in with the scope.