Buying the extra guns really isn't worth it. There rather expensive and their low grade weapons. Most likely if you lose your ship you lose that weapon so spending real cash on it now is pointless.

However if you chose to its in the voyager direct store on the website. You have to buy credits. The terminal itself to place it on your ship is somewhere in the hangar.

Earning credits becomes available at alpha by winning matches.

[Linked Image from i.imgur.com]

KGB TS Server Administrator
KGB High Chancellor - Star Citizen