Powerful PVC-Marble Sniper Riffle

My PVC marble gun is made up of 1/2" PVC as barrel, 2 pieces, 1/2" PVC Elbow, 1 piece empty wide mouth & thick plastic bottle, 1 pc. lighter ignition, a pair of wire, 2 pcs. 1"x4" metal sheet, few pieces of screw and a piece of wood formed as a riffle stock.

Additional items needed: 1 pc. plastic sprayer (empty cologne spray),  denatured alcohol, and marbles

How to use: With all the materials assembled together to form a riffle firing is just as easy as eating peanut. Just open the cap of the bottle, spraying 3 to 4 times denatured alcohol inside (depending on the size of the bottle), recap, put the marble inside the PVC barrel, and fire. The result is a very powerful blast that will send the marble flying vigorously fast towards any of your target. You can't even see the marble flew way from the end of the PVC barrel. This riffle can penetrate 1/8" inch metal sheet and can reach up to 600 yards depending on size of the marble if it just fit right into your PVC barrel, smaller marbles can travel less and the length of the PVC. This riffle is accurate even at 50-60 yards. I am using this riffle for hunting birds and so far I am pretty satisfied. I am also in the process of refining this riffle to produce more power and so far I have 3 with different designs and lengths. I case you are interested of my design  I am very much open to share it. The important thing is when you have one, you take full responsibility it.