Stunrods? They're difficult to bring down with rifle fire, but it's possible.
On the harder difficulties cyber disks have 34 armour and 0.8 resistance to bullets. Since rifles do an average of 30 damage you need a roll of 146% (44) to do just 1 damage (TFTD damage model runs from 50-150%, standard model is 0-200%). A max roll for the rifle and a normal hit from the HC is worth 14 damage.
Powerful explosives hit all sections of the tank for a 4x bonus, if your guys can handle the weight a large rocket has a 35% chance to insta-kill (104 damage for an average roll verses 120 health). When choosing explosives you need to roll atleast 58 before any damage gets past the resistance (0.6) and armour.
Early game I order my guys by strength using / * - and + to signify importance.
+ = 50 str = AC+RL or rifle and 2 extra rockets
- = 40 str = rifle+RL+rocket+clip
* = 36 str = rifle+RL
/ = 30 str = RL+rockets or AC and ammo
less than 30 strength gets a rifle and is first to leave the ship/assault enemy positions.
/edit I'm also a big fan of the
long corridor base layout.