Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to build an airsoft gun out of household objects [title] Drill 2 holes in a small container. [step] An old pill bottle, a film container, a plastic bottle of coca-cola, whatever you have lying around (with a lid! ) will do. Be sure to wash it first, though; you'll be putting the side of the bottle in your mouth.

Ending1: Most blanks will be large, so it works fine. [title] Add 1 1/4 " semtex paper to the plastic container. Ending2: [substeps] One hole needs to be centered on the bottom and the other centered on the side. A 5/16 " drill bit is best for a standard pen, but it can vary. Ending3: [substeps] Place something like screws or nails in the holes, and there is a good chance that it will open on its own. [title] Find the right container for your airsoft gun. Ending4: [title] Place the outside of the bottle into the hole. [step] The bottles should be much thinner, so that they don't use up much in your mouth.

Answer format: ending1/ending2/ending3/ending4