Good day members.
I need to make a correction..as mentioned/pointed out by members..the split -bridge action ( Portuguese replica .. not part of this description/discussion...my mistake ...

Here are the photos, what I did not capture was the three circles stashed in a form of a tri-angle.
All the parts are numbered 31..most peculiar is the magazine plate...the same as the Portuguese magazine plate... on one of the magazine plate photo you will notice the three rings/circles staggered in a tri-angle form..what mark is that?