As it belongs here, I'm re-posting my BA weapons writeup. It's from the Tactical help? topic.
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The best two guns for most occasions are the PPC and AC2.
The PPC is a high power long range weapon with splash damage, good against any target. It one shots battle armor and deals good damage to enemy mechs. Only draw back is it's slow reload time. Aim it at enemy battlearmor from above, when you fly over them, for maximum effect.
The AC2 is a fully automatic hand held cannon. It is capable of high damage when fired in full auto, but it's accuracy is low in this mode, so you have to be close to the target. However, if you fire single shots, it is capable of great accuracy. It's best used on mechs, but it will kill battlearmor if you're a good shot.
And don't dismiss the basic laser. It is not preferred, but sometimes it will have to do. It is a short range, but accurate weapon. It's best fired at enemy battlearmor where it's accuracy can be put to good use.
The bear AC is a rapid fire machine gun. It's well suited to taking out enemy BA, but it's not very usefull otherwise. So only bring it if you know you'll be fighting BA a lot.
Sorry I can't say much about the flamer, I don't have experience with it yet.