Looking for a rear clamp-on (pic rail style), and (in a perfect world, matching) front diopter set for the 55x series guns.

Not really interested in the MFI, as I’m not sure how much modification they take to fit the Swiss railed guns, or if they’re good for all but shorter range and aesthetics. And I am watching GB like a hawk.

Classic lower 550-551/552/553 height, or taller US 556 with a matched front.

Any assistance is greatly appreciated.