I've had an improved script for the portal gun sitting around for a while, with some new features including events, functionality, and co-op guns. If you felt like making a better, more Blocko-style model for the guns and a portal model (essentially the same size and shape as a 6x6f circle with a raised, color-modifiable rim) that'd be cool. I can show you everything I've done with it if you want.
If you're looking for weapons to add to your pack, there should definitely be some kind of sniper rifle that causes a large explosion when scoring a headshot. And maybe some kind of sci-fi plasma ball launcher with a low fire rate, low projectile speed, and very large explosion. Definitely have explosions, ok?