Roll it Landscape and tape it up.
Step 1: Other Way
Then roll another sheet portrait around the other then tape it up.
Step 2: Snippy
Cut an few incisions the same length away from the end so it completely covers it.
Step 3: Snip Snip
Cut off excess round the back.
Step 4: Fold Another Piece
Fold once and again and again until it looks like this and stick it on the side, make sure it is stuck to the piece of paper on top.
Step 5: Load It
And blow once a bullet is loaded (anything)