I'm not aware of any night sights for HK's outside maybe of adjustable sights that would do what you want.
HK does offer factory non-illuminated front sights in different heights to change the point of impact. You could try contacting HK and asking them what sight height will get you close to what your asking for. Then, see if any of the night sight manufactures offer a front sight in the appropriate height.
Something else you might want to try is a different bullet weight. You may just find one that will impact right where you want it with the sight picture you want.
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Last edited by NEOH212; 05-02-2012 at 02:47..