I don't think Gat needs changes. Merc maybe too effective against armor, but I thing gat is fine (takes gat a while to pierce armor escpecialy if you lack heavy ammo or have problems hitting - lately our gunners have been having problems bringing junker armor down even with heavy clip, takes 3.5 - 4 clips of gatling to take junker's Armor. Haven't tried it myself since 1.3, haven't had time to junp of a spot where I could - either helping new players or on hull duty. Can someone check Heavy clip + Galing and check bullet spread and bullet offset on heavy clip in comparison to none (according to tooltip description there should be no diffirence and no spread(?) ).
With firefighting changes either extinguisher and chemspray are too useless or fire is stacking much much too fast. Mostly flamers. Flamers weren't as bad as people regarded them in 1.2, people just weren't using them correctly. Iike having your a prymidion have flak in rear port slot, javelin in port slot, get in front left and carrorade front right. You still have a good weapon combo, but you are doing it wrong. Or have gat/flak front and use flak to try and kill armor and use gat to kill hull - it's a good combo but you are doing it wrong.
Now extinguishing fire takes 6 seconds (chem spray 3sec, extinguisher 3 sec) and 2 people. Other way you extinguish fire fast, but it lasts for .1 of a sec, before you have fire back or takes 18 seconds to extinguish fire with chem spray.