Dont look in the camera...
... seriously, it look kind of odd. The guns were pretty cool though, but it would be nice if there had been more variety (lazers, rocket lanchers, etc) and if you were shooting at something (maybe have a person fall to the ground; hit by an invisible bullet). I wish i had one of these guns. Just think of all the crazt things I could do with it... lol
hmmmmm
well, they were guns
and they were invisible
technically you didn't disappoint, but you did waste time
No entertainment value.
I don't wish to be cruel but this kind of "experiment" should probably be left on your hard-drive and not submitted to a website where only the works of people who can be bothered to complete a project are showcased.
Maybe try animating some characters to receive the gun-shots or something like that- then a least you might be able to build a story around it.
As it stands I am very disappointed in you.