Berail Gun is my favorite weapon in the entire BBG. Get it if you want, it's an infinite range, pinpoint accuracy that's great for sniping. It's AOE, but it doesn't hit characters. It hits the next wall/obstacle, which means if your opponents jump, they take less damage, but even then the lower HP classes are about 2 shotted. I would recommend Explosions+2 and Health +2 with it, as well as Propbearganda. Metal crush is fun to use with that set.
You should get carpet bomb for sanchez. It is a really strong weapon but also really easy to handle and fun to use. Parashoot is good for trolling but your aiming should be good. Drain field is also really fun to play. If you use it correctly you can het good kills with it. I havent tried invulnerable field yet so i cant tell you about that. Glue bomb is good in combination with carpet bomb and drainfield (but better with carpet bomb). And the bind gun is quite good. It deals decent dmg and slows your opponents. Use it to get close to your enemy and then use your melee to finish them off.
Gamma Ray(if it's joules don't remember)
Proximity Mines or Black Hole if you prefer to attack rather than defend.
Wrench(if joules again, don't remember) or the double wrench one which is 140,000
Speed+3 or 2
Ammo if you want or just use this slot for speed+3
This is the set I use because I am not wasting 60 gas or 80 gas on Musket and Bussaw(which is UP atm IMO)