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 itself came
from a small dollar store toy pistol. It's pretty cute but it is one
import toy not really suitable for little kids. The pistol had no
orange tip, and the laser is incredibly bright, perfect for junior to
blind other children or the family pets… When the toy’s cheap plastic
trigger broke I saw my opportunity to rob it for parts. The laser unit itself is encased 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. You adjust the
laser's aim by turning the screws on the front plate.
This is the front
plate, screws, and yoke...
Following is a view of the plate, laser, and yoke
assembly... The screws have been cut down due to the limited space
up front in the P90 receiver.
Following view is the rough cut outs in the lower receiver to
accommodate the laser assembly and the battery housing...
Next view is
the laser assembly and battery holder installed in lower receiver.
holder is just a small plastic box deep enough to accommodate three
watch batteries. The batteries are forced against contacts by the
force of a spring like any typical battery holder. I didn’t care for
the look of the holder which came with the toy pistol, so I scratch
built a new one in black plastic… but one could just use the holder
that came with the toy. I robbed the contacts and spring (with the
wires already attached) from a scrap AA battery holder.
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...
Warning: Laser-sighting devices are dangerous to human eyes. You must
use them with caution and not flash a laser sight into someone's eyes.
Although we have not had any serious issues, I would not blame a game
host for ejecting someone reported to be misusing a laser. Respect
your fellow airsofters.