My bad, Datsun! After TG's post, I looked up what a locking lug is. lol! I had been thinking it was a linking pin (like on my 1911s). Guess that's what I get for being a psychologist, huh?

Anyway, my Ladysmith does have a locking lug.

In this picture, you can see the lug on the top of the barrel:


and, in this picture, you can see the recess underneath the top of the slide where the lug rests: