williamlayton: packing a long slide for personal carry might cause you a few problems. First, I'm not so certain there is a large holster selction out there for you and Second, it is another inch or so you have to drag out of your holster or belt, and with most of the sights I've seen on longslides, they are not very conductive to a 'rapid presentation'.
One of the gun mags just ran an aritcle on a long slide - made by Caspian Arms, I believe and in 45 acp. Now, you want a 10mm longslide - hmmmm - maybe Clarke, he was one of the first long slide makers. Beyond the two already mentioned I'm at a loss to be able to kick in any more info. Perhaps some of the other posters could be of more help. Mikey.