When you find an upgrade component that is marked "Rifles", this are the weapons that you will be upgrading to (if you choose).

Rifles(Scroll down to a weapon to see stats)
Shotgun
Ammo-50-200
Range-10-12ft
recoil-1/2ft
Damage-50-100
AmmoType-Shotgun Shells

Double BarrelAmmo-50-200
Range-10-12ft
recoil-1/2ft
Damage-50-100
AmmoType-Shotgun Shells

Automatic Double Barrel
Ammo-50-200
Range-10-12ft
recoil-1/2ft
Damage-50-100
AmmoType-Shotgun Shells

Sniper Rifle
Ammo-50-200
Range-10-12ft
recoil-1/2ft
Damage-50-100
AmmoType-Shotgun Shells

Quad Barrel
Ammo-50-200
Range-10-12ft
recoil-1/2ft
Damage-50-100
AmmoType-Shotgun Shells

Automatic Quad Barrel
Ammo-50-200
Range-10-12ft
recoil-1/2ft
Damage-50-100
AmmoType-Shotgun Shells