dont need to spam so much message, edit old ones instead....
build I myself use in my arena rank 1 mech is Heat Orb Cannon + Twin Terminator R (common, range 2-4 knockback 1). Heat Orb is myphical, but it can be replaced with Rear Hit Heat Mark (legendary). Good thing in this build is that you are not defenceless at range 2-6 (and can push enemy towards range 4), and at range 3-5 can attack enemy twice while keeping same distance, also, only one top weapon slot is used allowing to also use other top weapon of player's choice. Legs and torso are of player's choice, too, but this build uses no ammo, so it is recommended to use torsos without built-in ammo and probably as much HP and resists as possible, to survive longer. Of drones, Evil Twin and Triple Laser Pointer are good.
alternatively, you could try Saurus Rifle + Rear Hit Mega Mark (both legendary), to do same thing with physical damage. Sadly, it seems best physical drones eat bullets. Also no electric damage alternative, cuz electric mechs don't work properly unless energy damage per turn exceeds certain point.
but, no matter what. I would prefer for new player to try and think with their heads, instead of blindly following "guides".
P.S. replace this topic to somewhere else pls. Probably to General Discussions