FP-AG or FP-GR

I believe the GR has a lower line of sight than AG. I believe you can use either on an airgun with a dovetail receiver. I have the FP-AG-TK version on my Marauder. Works great. It is also high enough to accept a Gehmann adjustable iris and bottom out the elevation adjustment with about 3mm to spare above the rail. I don't think that iris would work on the GR the way it sits on the receiver in my case. Just something to think about depending on your application.
Edited to add: Looking closer at the GR version, it appears the vertical dovetail holding the aperture plate is shifted back, such that the aperture plate can ride down farther than the AG version, which has it's vertical dovetail positioned such that the aperture plate is directly on top of the mount base.
 
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As rice pointed out, the two versions have higher or lower sight lines. I have a number of AG that require the higher sight line and am happy with that option. Weirdly enough one (and only one) of my HW90's shoots 3" high at 10m with the TK bottomed out. I use the factory globe front sight on all of my HW90s. What I am trying to say is that you may need to try it and see. I suspect that the elevation slide on the GR is long enough to work with your current front sight.