Reach the indicated level to unlock the corresponding weapon.

Repeater Carbine : Level 2.
Throwing Knives : Level 3.
Volcanic Pistol : Level 5.
Winchester Repeater : Level 8.
Schofield Revolver : Level 9.
Pump Shotgun : Level 11.
Springfield Rifle : Level 13.
Dynamite : Level 15.
Double-Action Revolver : Level 17.
Sawed-Off Shotgun : Level 18.
Rolling Block Rifle : Level 20.
Fire Bottle : Level 22.
Semi-Automatic Pistol : Level 24.
Semi-Automatic Shotgun : Level 26.
Carcano Rifle : Level 28.
Henry Repeater : Level 32.
High Power Pistol : Level 35.
Bolt-Action Rifle : Level 40.
Evans Repeater : Level 43.
LeMat Revolver : Level 46.
Mauser Pistol : Level 49.
Buffalo Rifle : Level 50.