Was it ever confirmed that Brainiac 5 inherited his force field from Brainiac? As I recall, that force field was pretty strong. IIRC, in Brainiac's first appearance, Superman punched it as hard as he could and did zero damage.
Brainiac 5's primary super power was his super intelligence. Anything he created that helped him or other Legionnaires fight was more of less expected. In the short-lived Legion of Superheroes cartoon,he had a mech suit similar to Iron Man's armor that he would put on if he got caught in a fight. Has he ever created something like that in the comics?
Speaking of his force field belt, was it ever explained why he didn't make them available to other Legionnaires (I imagine the main reason was because no one thought about it). I imagine it could have been very useful to some of the team with less physical powers like Saturn Girl, Dream Girl and Princess Projectra.