Airsoft P90 BTC Chimera/HPA trigger and selector microswitch conversion

thingiverse

Here is the 3D printed hardware that can be used to convert a Tokyo Marui P90 from its standard trigger and selector mechanism to micro switches for both functions. This conversion kit is intended for use with either a BTC Chimera, an HPA system such as a Polarstar, or your own custom setup. The pictures included show the correct switch being used as an example, which is a SP0603 6mm SPST Micro Tactile switch from Jaycar Electronics. You should be able to find something similar at most electronics stores. The microswitch for the selector is also from Jaycar and is an SM1036, a very common design. The trickiest part of the installation is gluing the two selector mounts inside the body. It's actually quite easy with a pair of angled tweezers and some super glue. Simply hold each mount as far back and up as it will go. I haven't tried using acetone to see if that would work, as I wanted to be able to remove it during development. Cut some rectangles out of 1.2mm thick prototyping board to suit the installation. The selector one has a rectangle cut into it to allow the bottom of the switch to sit flush with the bottom of the board. It cannot sit lower, as correctly installed the selector board mounts sit the board as low as possible. The selector switch requires a small lump to be added to push on the micro switch, as shown in the photo. You can use whatever material you prefer, I used some epoxy putty. The trigger stop and trigger button depressor have a little extra meat on them. Sand these to suit your needs. There should be no excess travel on the trigger microswitch, or during a game under stress you will definitely over squeeze it and break the glue on your mount or damage the switch itself. I figure if you're actually undertaking such a conversion, a little gluing/soldering/sanding the trigger tolerance is probably no challenge to you. This was all done in Sketchup, and printed on a completely stock DaVinci.