The Ring of Fire currently has 2 triple mount turrets with no weapons and 2 torpedo launchers with one torpedoes each. The launchers are hidden underneath the wings. The torpedo launchers are special made single torpedo launchers. Normally only a Capital Ship carries torpedoes

Up to 6 weapons can be placed pretty easily in the turrets. Military weapons are surprisingly "plug and play." They are very obvious though so you will probably want to replace them with "pop-up" turrets.

You've got 1 pulse laser and 1 autocannon in the cargo bay from the last adventure.

The Launchers are worth about 500k credits total and the torpedoes themselves are worth about 15k each. The turrets themselves are worth 1 Mcr each. The autocannon is worth 250k and the pulse laser about 500k.

(1 Mcr = 1,000,000 Credits)

The Ring of Fire's power plant is to small to support any kind of laser weapon. You're best bet is to probably try and make a deal where you swap the turrets, laser, and torps that you have for some pop up turrets. You can also keep the torpedoes but they are expensive to reload.

Gamewise there is no difference between the Autocannon and the Pulse Laser. The Autocannon just needs ammo and the pulse laser doesn't.

Pop up Turrets cost this much:

Single Weapon = 1.2 Mcr
Double Weapon = 1.5 Mcr
Triple Weapon = 2 Mcr

The autocannon does 1d6 damage to a spaceship and the torps do 4d6 damage. For a frame of reference your ship can take about 16 damage before becoming crippled. The autocannons shoot bursts but the rules don't get into how many bullets per burst. One ton of autocannon ammo gives you 12 shots and it costs 15k for a ton of normal ammo. HEAP ammo for an autocannon costs 45k per ton but does 2d6 damage.