1) Yes, my Frommer will feed a Winchester Silvertip from the magazine.
2) Yes, my Frommer will ignite the primer on a Winchester Silvertip.
3) Yes, there is an amazing amount of monkey motion you can feel in your hand when a long-recoil pocket pistol is fired.
4) No, a long-recoil pistol will not work without an extractor, unlike most blowback or short-recoil pistols.
So now we know.
I'd put a Frommer Stop extractor on my Amazon Wishlist but A) I don't have a wishlist, B) Amazon doesn't carry Frommer Stop extractors.
PS: Now I want a Gabbet-Fairfax Mars. And people in hell want ice cream.