We were talking and he said it would look cool for his night games if he had a Predator style laser site for his rifle.
So, I looked on eBay and found some red laser modules that run on 3.4V at around 17mA each. To keep it quick, simple and easy to both assemble and to fudge about later I chose an adjustable DC – DC converter to drop the voltage from a 9V PP3 battery. This also allows you to tweak the voltage to get the best results.
1 x Plastic housing that will fit to the barrel / stock
1 x 9V PP3 battery
1 x battery clip
1 x switch
1 x DC – DC converter
5mm plexy or acrylic
3 x laser modules.
Step 1: Mark and drill
The laser heads I had were 8mm diameter, so you simply drill the 8mm holes in the plexi. Cut it out and round off the corners. Use this as a template for the end of the housing, then open those holes up to around 9mm to make the assemble easier.