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Page Handguns » FN
Posted: 8/13/2017 12:49:26 PM EDT
Does anyone know what aftermarket sights are available for the 509? Preferably fiber optic and tritium front sights and plain black rear.
Link Posted: 8/13/2017 1:54:23 PM EDT
It takes standard Sig (and XD?) sights, I'm about to put a set of Sig X-Rays on mine.
Link Posted: 8/13/2017 4:26:06 PM EDT
Thanks

It looks like the x-rays are 8/8 size sights. Is that what the 509 needs?

I measured the 509 sights with calipers. The rear is .235 and the front is .250. Those don't seem to match against the sig chart.
Link Posted: 8/13/2017 11:53:18 PM EDT
[Last Edit: 8/13/2017 11:54:22 PM EDT by doty_soty]
FN customer service says the FN 509 sights are modeled after 8/8 height Sig sights. I'd see how yours prints first, then go from there. You'll find quite a few combinations of heights for the Sig X-Rays (I see varying combinations of 8's and 6's, Sig CS could probably even hook one up with 7's).

Mine needed no adjustment and the stock 8/8 gives a perfect '#2' sight picture (top of front sight bisecting poi), though as always there may be minute variations that would make it prudent to see where your specific one prints.
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