Bbs Top List What Are The Nozzles On Bb Bottles For?

What are the nozzles on bb bottles for? - bbs top list

I bought my first air rifle gun. I bought a bottle of BBS had a nozzle at the top .. What is it? If the charge is, is not effective because you are still custom BBs. (unless you shake the bottle)

In addition, it makes sense to buy a gun, air rifle? (Not a CO2 (gas) or an electric motor, a spring pistol)
Thanks