Between 20 and 30 feet
Your choice. I personally prefer the normal barricade
The Barricade
No, the Nerf Barricade requires 3 AA Batteries in order to function at all.
i would recommend the deploy but if you like submachine guns i would go with the barricade
The Barricade RV-10 costs $16.99 according to the Nerf website home page.
35 feet
The Nerf nitefinder can shoot up to 36ft (10.80m) without modifications. Trust me, I have done it before.
It can shoot 30 or 35 feet normally.
The Deploy can shoot up to 40 feet if you are lucky.
about 30 inches
50 ft
About 15+ feet.