Here's an obscure one, a pistol designed by one A.J Thomas, it's a .45 Auto pistol with an unlocked breech, and what looks like a grip safety, but in fact this also is an actuating lever where, get this, your grip on the pistol works as the delaying mechanism for the slide.

So, a "hand-delayed" blowback action? Never saw much production, but there's a few of these pistols around.