doing a school project on gun laws in Canada. i have some question could you guys help

[kennymo]

If you have a spud cannon that's capable of greater than 500fps, and you take it apart, are left with a few lengths of pipe, one of them is the receiver. But it's just a simple pipe.

Another issue - how do you lock out one of these guns?

In the case of mine, you take away the 120 psi compressor. Then it's useless.