I have a H&K U.S.P .45 replica airsoft gun. In all honesty it is good but it can't compete with any airsoft rifle or shotguns. It needs all the help it can get and when the going gets dark a flashlight is just what you need. A quick google search or some T.V watching will lewt you know that every cop has a flashlight mounted under the barrel of his/her trusty sidearm.This is an easy part to design and to learn new software, plus it''s under 3 inches so you can use it for a free instructables print. You could buy this part online, but it would probably be more expensive, If you could even find it.
Will upload pics of finished part when I get it.
Step 1: Materials
You will need:
An airsoft gun (as a reference for sizing)
A micrometer or ruler, depends how precise you want to be.
3D Design software. I used Autodesk Inventor (free student version) but there are free alternatives like Google sketch up or Blender.
Access to a 3D printer (or free instructables print) or cnc if you can.
A flashlight also for sizing reference.
4 bolts and nuts (small)