oops, I guess I was wrong there, it does block the bolt closure. but then so would the long shackle padlock if you put it through there without the metal stamping.
The new thing in gun locks are the built in ones, some of them are very tiny locks, I do not know enough about them to say if they are common lock types, or if they are something new and different. the glock dimple sounds interesting, but a dimple lock can be picked, sometimes very easily, I wonder if it locks up if there is not a key filling the keyway when its turned.