Summary

i had a laser housing and an empty ps1 namco gun shell
so i made a laser gun

Instructions

it uses 11mm laser housings, just the silver one people usually use
i included the sketchup file if you want to edit it
you can turn a namco gun into a laser gun without any mods to the case, you just need to empty it out
for the trigger button, i took of the reset button from a fried arduino mega, soldered it to a piece of perf board that fit in the holder and connected it to the circuit in series, its obvious once you see the trigger assembly

PS1 namco gun laser mount