About all you could do is put a small red dot on the side rail and that would just look dumb. The P90 is a bit of a unique case with the swap-able upper receiver to use the original FN type optic or the tri-rail setup to use an aftermarket optic.
There are aftermarket options for the real P90 re this but the cost won't be reasonable.
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Airsoft, where nothing is hurt but feelings.
Last edited by Danke; August 30th, 2017 at 02:01..
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