Here's another extremely affordable airsoft-themed project for you to try. All you will need are a few items that you are likely to have in your house, if not, they are all very inexpensive. Surprisingly this was much more effective than originally anticipated, and although it doesn't look great it is fun to use nonetheless and will probably look better if it's painted too. I try to make most of the tutorials about my designs however THIS IS NOT ORIGINALLY MY DESIGN - SO PLEASE GIVE CREDIT TO THIS GUY: http://www.youtube.com/watch?v=GBhqi865NLw
Step 1: Tools and Materials
A 2L Bottle, 3/4" / 22m PVC Pipe (2m cost only ~£0.60), Abrasive / Sandpaper, Tape (I used electrical but any should work) Paper Towel, airsoft BB pellets (bad quality 0.12s will work) Hacksaw or PVC pipe cutter.
Step 2: Making
Making is very simple so I think it can be explained in just one step. Cut your 3/4" PVC pipe to desired length using either preferably a PVC pipe cutter or alternatively a hacksaw, making sure the pipe is securely held in a vice when cutting. Then sand down one end using abrasive / sandpaper so it will fit inside the top of the bottle. Once you have done this, hold it in place with the tape. The thing on the end of the barrel is a cheap homemade amplifier thingy that I made, and it also acts as a funnel to help with re-loading. Original creator: http://www.youtube.com/watch?v=36OAnHSwyNA