Do the rifles wielded by General Sarris's troops in the movie Galaxy Quest look an awful lot like the "Z51" guns that Jean-Baptiste Emanuel Zorg gave to the Mangalores in The Fifth Element or what? A bit smaller, yes, but the design is rather derivative. You'll have to take my word for it. I can't find pics of the weapon in Galaxy Quest. Both are a form of bifurcated ovoid that one wears like a kind of sleeve or cuff.
Both movies are pretty good. I favor The Fifth Element, though as it's less predictable, a bit better written, and has an awesome score. The acting in both is surprisingly good, considering that they are campy movies and not intended to give any particularly moral or meaning. Sure, one could pull out the deep messages that happen to be in each, but I recommend that you just watch them for fun.