Step 1: Gather Materials
There was only one place to get stainless hardware in my small college town, so I had to make do with what I had.
I bought some stainless machine screws(needed bolts), nylock nuts, and 1/2" clamps.
I had an old inner tube lying around to use in the clamps to prevent squeaks.
Finally you need the ammo box they are commonly refered to as 25mm ammo box(or can).
They are made of heavy duty plastic, open at both ends, have a rubber gasket, a removable divider for the projectiles, and they should be waterproof.
25mm ammo box