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Old July 10th, 2011, 13:25   #6
Kos-Mos
 
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Join Date: Nov 2005
Location: Lévis (QC)
Modding a P90 to have internal illumination (at the hop-up/mag joint) is stupid easy.

There is plenty of room on both sides of the hop-up unit.
There is also quite some space above it.
The BBs are travelling in a clear magasine, close to the surface of the gun along the body.

You just need to make a hole (I would say about 15mm long by 4mm) and install 4x UV 1500mc LEDs (they are about 5-6$ each, you have to ask at the counter in electronic supply stores, forget about The Source). It will have PLENTY of time to charge-up the BBS just before the feed to the hop-up and at 6000mc, you will get roughly the same power as a TM/Madbull tracer. Plus since it's UV, you will see a weak purple glow from under the magasine. At 4' it won't be visible anymore.

Finally, rig it to your main battery, with a NO switch to detect the magazine-in condition and turn off the system when no mag is in.
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