There is an instalation method that places the sigh down low on the frame. I don't know how it's done, I think that some cutting into the frame is involved. I've seen it on Glocks. There's one in the middle picture on this http://www.bowietacticalconcepts.com/Don't understand what U mean. MELT?
Thanks, Sniper.Not fimiliar with that Jpoint sight ............. but that type of sight has been around for many years now. The company that pioneered this type of sight was " DOCTOR" . Check it out.......it is simply the best money can buy at almost $400 a pop !! [ Google Doctor's gun sight ]
Doctor also provides many mounting platforms to use on pistols - don't know if they have one for the Walther yet. I know they make one for the 1911