http://fnforum.net/forums/fn-ps90-ac...p-project.html
I stumbled across this post a while back when looking up height over bore solutions for P90's. I thought it was an interesting mod and earlier in the year, I had some time to mimic it.
Mine differs in that I chamfered the edge to allow for more mounting options like angled light mounts. The rail is by ICS and was meant to be used on their MX5 series rifles. It had the wide spaces between picatinny grooves like in the pic but alas, the bottom part of the rail is off spec. It's too wide. Not terrible but qd mounts will have to be adjusted to fit properly. So, no cross- platform optic swapping for the P90.
Here is what I came up with...
What I used:
-Metalset A4 aluminum filled epoxy (from aircraftspruce)
-2024T3 aluminum bar (from aircraftspruce)
-hacksaw
-vise
-various files
-240 sandpaper
-2 M5 countersunk hex screws (from hobbyking)
-Armor Coat rust paint aerosol (real stinky)
-Johnson drill guide
-M5 tap
-ICS MX5 tactical rail
The rest of the P90 is made of a fiber-reinforced nylon and not ABS. The fake/molded in lower receiver screws commonly seen in the King Arms Ultra Grade, TM's, JG's and Classic Army's are replaced with actual steel hex screws. The interior has 5mm felt sheets on either side of the gearbox for sound dampening. I secured it spray adhesive. I used dynamat before but it was too sticky. I wouldn't recommend it. I can post up the templates I used to make it if anyone is interested.
My next project: A home made laserex-style laser...if I can only get that damn lower receiver to crack in half. Its resisted the tried and true hair dryer method thus far.
I also came across these in my wanderings. The metallic blue one is really really low. You'd have to lie your head down like you do when your head hits a pillow to get a proper view down a lower sight. I also like how the docter sight is backwards. lulz
http://fnforum.net/forums/fn-ps90-ac...stom-90-s.html