The real-deal “Laserex” version is very rare in airsoft circles. Too pricy and requires you to crack your precious P90 body in half for installation. Not so with this homemade version which yielded excellent results for a fraction of the cost. Installation is straight forward if you have some experience building models and can solder a couple of wires together.
The laser came from a small dollar store toy pistol. This was one import toy not really suitable for kids. The pistol had no orange tip, and the laser is incredibly bright, perfect for junior to blind other children or family pets… When the toy’s cheap plastic trigger broke I saw my opportunity to rape it for parts. The laser unit itself is incased in a small copper cylinder about one cm long. The business end has a small window, and the other end has two small wires to power it. It runs on three watch batteries. I chose to mount the battery compartment so the upper receiver normally hides it.
The laser is mounted in a plate cut to the same profile as the end of the P90 (just below the flash-hider). Although the real-steal version may be metal, I chose to use black plastic from an old drill gun battery case because it’s similar to the material the P90 body is made from and you can use solvent glue on it. I used the same material to make a yoke for the back of the laser to sit in. Three screws feed in through the plate to support the yoke, and springs allow the yoke to float so that fine adjusted to aim can be made after installation.
Plate & yoke
Plate & yoke laser assembly
It’s a simple matter to remover the trigger assembly from the P90 lower receiver. This gives you access to the inside area where the push button is mounted. With tweezers one can slide the wires underneath the trigger seat into the front body section. The push button was acquired at the local Radio Shack/Source for 4 bucks and is installed with a small rubber o-ring to help match the curve of the P90 body. I positioned it so you can hold the P90 comfortably whether your finger rests across the button or not.
After a few evenings work and a careful set-up the result is pretty sweet and I can’t wait for my next CQB engagement...
(I can post more pics of the project in progress if there is interest... I don't want the mods to shoot me.)