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

Automatics (Scoll down to see a weapon's stats)
Machine Gun
Ammo-50-200
Range-10-12ft
recoil-nil
Damage-50-100
AmmoType-Bullets

Chain Gun
Ammo-50-200
Range-10-12ft
recoil-nil
Damage-500-1000
AmmoType-Bullets

Nailgun
Ammo-50-200
Range-12-14ft
recoil-1/2ft
Damage-1500-2000
AmmoType-Nails

Super Nailgun
Ammo-50-200
Range-16-18ft
recoil-1ft
Damage-3000-4000
AmmoType-Nails

Spike Driver
Ammo-50-200
Range-10-12ft
recoil-1/2ft
Damage-5000-6500
AmmoType-Spikes

Hyperblaster
Ammo-50-200
Range-20
recoil-2ft
Damage-7000-9999
AmmoType-BatteryCells