I've found myself getting "stuck" into bringing a Quasar or EATs for every mission. I want to branch out and use other support weapons, but killing the big boys is just so much more work with anything else!
AC + EATs will let you handle anything. I find myself missing my AC for hordes of medium bugs/bots when I bring quasar and shield. Chargers can also be 3 shot in the butt with the AC and it'll bleed out a few seconds later. I find the leg trick to be too inconsistent.
This is pretty easy really, you let the charger change you, dive to the side, and shoot it in the tail 3 times. Then watch it bleed out as it slowly walks around.