Instructables

Simple and powerful airsoft gun using bottle and medical syringe

Picture of Simple and powerful airsoft gun using bottle and medical syringe
Everything you'll need is in this picture. I think that all is clearly visible. In some may be required drill or something to make holes, some hot nail will serve just good.

The principle is, you will use the bottle like air tank, air will be filled with pump trough valve taken out from bike tube, medical syringe will use like trigger which will be triggered by pulling out some wire or screwdriver (in my case) from piston. The bullet will be located in cap,more accurate, in pipe ( i prefer that you put some rubber on begging of tube so BB-s don't fall out) . And that the whole story, now lets go to work.
 
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Step 1: Step 1: drilling and setting the valve

Picture of Step 1: drilling and setting the valve
Drill a hole in bottom of the bottle to fit valve inside, make sure you drill it in the middle because there is the thickest layer of plastic (for every case).

Step 2: Step 2: Inserting the valve

Picture of Step 2: Inserting the valve
Drop the valve through the topside and somehow get it in position like is it in the picture, it could be very tricky.
After you did it, take hot glue gun to seal the valve in place an prevent air to bypass a valve. My method was that I push the valve a little bit inside of bottle and tilt it on the side, and then I took hot glue and drop it from topside near the hole, then quickly take a valve and pull it down (simultaneously rotating to be sure that glue covered all edges of hole). After that I just put some more hot glue from outside to make seal it tight.

Step 3: Step 3: bottle test

Picture of Step 3: bottle test
Seal the bottle with cap, pump air in it and check if there is some air leaking, if does, then repeat previous step.

Step 4: Step 4: outline medical syringe

Picture of Step 4: outline medical syringe
About medical syringe, it should fit just perfectly in the bottle, if not, then you have wrong syringe.
Insert syringe in the bottle like shown and outline syringe where is top of bottle so you could have orientation in further steps.

Step 5: Step 5: Outlining for cutting

Picture of Step 5: Outlining for cutting
Put top of the cropped bottle on syringe and outline edges and middle. The middle is where you'll be cutting hole.