Heres my ideas:

[Raycast Shooting] Minigun - Fast fire rate, extremely Low damage, Lots of Ammo, infinite range

[Prefab Shooting] Rocket Launcher - Splash damage, High damage if its a direct hit, not a lot of ammo, low fire rate

[Raycast Shooting] Railgun - Infinite range, High damage, Extremely slow rate of fire, Extremely low amount of ammo

[Prefab Shooting] Plasma Gun - High fire rate, low damage, lots of ammo