"Does H&K make a 10mm? Does Sig make a 10mm?"
No and no. I have *heard* that a USP40 or P220 can be converted, but I wouldn't recommend either.
"And, Castlebravo I visited your web page, have you tried to make the Delta Elite and Witness misfeed? I read you tried to make the CZ-75 misfeed and could not. You also mentioned the Glocks can be forced into misfeeding by limpwristing,that is the first time I have heard that.I assume you are talking about the big bores. Another reason for me to stay away from the Glocks for my purposes."
Dude, I try to make EVERYTHING fail. I'm paranoid.
The deal with limp-wristing Glocks is that it varies 100% from person to person, more than from model to model. I'd shoot my Glocks (I've owned several) left-handed and try to get the vaunted limp-wrist jams, and never did. A friend of mine (who is not a swishy little sissy
) has limp-wrist jams all the time with a two-handed grip, but only with Glocks. I'd just say shoot a Glock, or any other light polymer-frame handgun before you buy one.
The Witness was very reliable once I got the newer-design factory magazines. I got it when they first came out a couple of years ago and that was the only snag. You can carry the Witness C&L, which is nice. The only serious problem with them IMHO is that they ship with a weak recoil spring; I'd suggest something around 20lbs or so from Wolff Gunsprings. If you want some improvements done to one (two words: trigger job), then you might want to try D.R. Middlebrooks:
http://www.tacticalshooting.com/new/gunsmithing.htm
My Delta Elite was reliable with almost everything box stock. Once I let Dane Burns fiddle with it it will feed ANYTHING.