If you get a ray gun you want to have a machine gun out and use that, only use your ray gun if you get into a situation or it's a high round and your machine gun is dated.

If you have a thunder gun don't spam it, only use it if you have too.

If you have monkeys only use them if you have no ammo and you have to get a new gun or throw one because someone is downed.

On high rounds ammo is vital and saving it makes you survive longer.

If you have little ammo use the traps.

One other thing is if you get a gun take it and use it (don't swap your ray gun or thunder gun) don't waste the ammo.