Last updated for Star Citizen 2.6.3
FPS weapons can play an important role in helping you survive in the verse, so it's a good idea to always carry the best weapon for the job. But first, you're going to need to learn how to try out and purchase different weapons.
There are many weapon stores located around the verse. There's one in Port Ollisar, one in GrimHex and also one in Levski. Each of these stores sell different items. For example the GrimHex weapons store sells Outlaw weapons and armour, whereas the weapons store located at Port Ollisar only sells lawful weapons.
Cubby Blast is a shop located in Area 18 which sells any weapon you want. Every item that can be purchased in Star Citizen can be found at Area 18. Unfortunately, Area 18 hasn't yet been added into the Persistent Universe, but it can be accessed via the main menu.
Once you've arrived at Area 18, exit the elevator and turn right. Go through the door ahead, passing through check-in area.
Now turn left. You should see a shop called 'Cubby Blast', the weapons and ammunition store. Enter into the store and you'll see every weapon currently in Star Citizen, and also every set of armour.
To inspect a weapon, go up to it and select the 'Inspect' option with F. Press F again to exit.
To purchase a weapon, go up to it and select the 'Buy' option with F. Complete the checkout on your Mobiglas.
To equip the weapon you just purchased, go up to it and select 'Equip'. You can't use weapons in Area 18, so to try it out you'll need to join back into the Persistent Universe.
No. You don't have to worry about repurchasing weapons when you die, however this will change in the future.