In this Instructable, I will show you what you need to assemble a tactical light for your air soft gun, for under $10.
Step 1: What You Need
LED light from Harbor Freight (http://www.harborfreight.com/3-1-2-half-inch-nine-led-flashlights-2-pack-97036.html or http://www.harborfreight.com/35-inch-9-led-mini-flashlight-65020.html) Look for cupons that let you get these for FREE!!!
1 inch Weaver style scope rings. Any 1 inch ring will work, high or low profile. I am using NCStar rings (http://www.airsoftgi.com/product_info.php?products_id=9972)
Automotive cell phone charger or cable with 2 wires in it or two wires in heat shrink.
Thin piece of plastic (credit card)
Heat shrink tubing
Stick on Velcro
Electrical tape or Scotch tape
Wire strippers and cutters
Screw driver and allen keys
Step 2: Light Assembly
Loosen the top of the scope rings and slide the light into them and tighten the rings. If the light is too loose, wrap a little electrical tape around the light and try it again. Do not tighten the ring too tight at the end with the screw on cap or you wont be able to take the cap off to change the batteries. You can stop here and mount it to your gun if you do not want a pressure switch.