This is a cheap red-dot scope I made using house-hold materials. The only thing you might need to buy is electrical tape.
Step 1: Materials
These are there materials you will need:
1 toilet paper roll
1 Roll of electrical tape (scoth tape can be used, ut will look much better with solid black tape)
1 Pair of Scissors
1 Sharpie, color of your choice (Red for Red-Dot, I used Green in this one)
1 Saran wrap roll
1 Gun to mount it on (I used my Airsoft UTG MK23)
These are house-hold materials, except maybe the electric tape.