Any blocks can be stacked to look like a gun. If you want it to actually have movment and possibly shoot something then you'll need techinc pieces.
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I have launched items with LEGO
Ok lets specify then. If your looking to make a trigger mechanism technic pieces come in vary handy. But when there is a will there is a way. Heavily modded blocks can do about anything you want them too. Get yourself a Dremal, Super Glue, and a soldering iron you don't mind screwing up the tip and anything is possible.
Why would you want to ?