When I was very young (I think around 7 or 8) I used a Retaliator and loved it and it only jammed once or twice even though it was my first clip fed blaster.
A lot of people are hating on this but adding a larger section of PVC around the end of the extension (for flash suppressor) and then painting it could look like a pretty cool pistol with a barrel extension. Another idea is making it so the barrel extension go through the stock barrel extension (with larger section of PVC like mentioned before) for realism. I am actually considering this mod for mine to make a Uzi W/ barrel extension Nerf gun (It would be just a show gun of course).