Battering concerns forced a change in the Delta's design (the cut-out). However, Colt ended production because they felt there wasn't a market for it. Well, wasn't the first time that Colt screwed the proverbial pooch. The 10mm (and especially the Delta) have become a Colt fave.
Oh, lendringser, I've always been a 10 mm fan. In fact, I've got a Glock 20 in my arsenal . . . I mean, collection, now. Sweet! But, it's a little chunky for carry, so a 1911 would be nearly perfect.