Simple dummy flashlight loosely based off of a TLR 1. Its missing the on/off switch. I could only really test it on the picatinny rail of the ICS Carnotaurus but it should fot most normal pic rails if its a tight fit i would recommend you to heat the side pieces with a lighter and while they are still warm you slide the light on the rail and let it on until the light has cooled off.

Assembly:

you put the smaller piece into the cut out in the light with the bevel on the small part facing bachwards. you hold the piece in place and compress a spring ( outer diameter roughly 5.5mm, length around 20mm) and slide it between both pieces then you push the spring into the middle of the light where it should decompress and snap into the holes.