Excellent work, the only thing I would suggest, is the trigger and trigger guard are way to small to accomodate a hand that can hold that grip.

Feel free to do what ever you want to do with it

Technically if this is an alien weapon, I guess its up to the aliens :)

now i like this one

but some add features are excellent-a ammo counter,loading socket(if is on energy),and i\even a grenade launcher,like the pistols from battlestar galactica

very nice