JPK:
Quite right. The photo of a bar-action lock on the Hallowell site is more in line with what I had been calling an 'intercepting sear', being precisely a second sear in form and function.

I had always referred to the design pictured in my previous post as an 'intercepting safety', since it has no 'sear' as such and no actual 'bent' in the true sense of the definition. I now appreciate that they are both the same thing, ie 'intercepting safety sears', and that the variation in design is more likely related to whether the lock is back-actioned or bar-actioned, and the logistics of available space. The Purdey pictured earlier is a neat compromise on a bar-actioned gun.

Here to learn!