Although I am fairly new to night vision I have did some playing around with my PVS-14 and I can tell you that you would probably not see the front sight or not see the target, take your pick.
You have to have either a red dot type device in front or a laser. The laser is a whole other topic though as you must be careful with it's use.
The other problem you would have is with the fact that it is cheap night vision. You would probably need a Infrared light source mounted on the gun to brighten things up and aquire the target and even then, depending on how cheap the night vision is, you might not be able to get a clear enough picure to identify the target properly.
There are people out there that are more of an expert than I on the subject but since they did not reply I thought I would chime in.
My advice, sell some guns and get the good stuff and set it up right. I am very happy with my PVS-14 set up.
-juiceman out
(like a fat kid playing dodge ball)