Is that Mepro front you ordered for CW/CM slides??? The only Mepro N.S. I see is for a dovetail cut slide.
Correct Trijicon front for CW/CM "pin-on" style is here.
http://www.kahr.com/Sights/Kahr-CWCM...itKWTFNSKT.asp
Trijicon, Dawson, and XS big dot, are the only NS I know of available for CW/CM Kahrs
EDIT: Ha ha Greg, I am too slow a typist... maybe Jocko can give me some pointers