And at the moment working on a new Hand Phaser from Star Trek: Nemesis. After that I will work on a Phaser Rifle and Tricorder from Nemesis.
With the P90, I have tried to make a firing machine gun, but it is a little above my range of skills. However this model P90 has a lego cannon in it that fires.
A MACO Pulse Rifle from Star Trek Enterprise:
A Phase Pistol from Star Trek Enterprise:
A P90 from Stargate SG-1 and Atlantis:
And the First version of the Phase Pistol: