Receiver rail guide.

[1969goatman]

So you want a close-up like the one above? I was using factory loads, Fiocchi. At one point (The day that I noticed this fin was no longer on my gun) the toggle locked back on firing it. It was as if the hold open was activated, but there were rounds in the mag, toggle locked back, this was the only time out of 500 rounds this gun ever did this (TO ME). As a matter of fact this is the only time this gun ever failed to feed for me. I am starting to believe at this point, is when this fin snapped off the frame.

I had a VOPO that had one of these fins busted off and one other Luger. Being they are so thin, to me it seems maybe just a little logical that in time (We are talking a 90 year old gun, that looks well used) that these little 1/16th pieces of steel would eventually fatigue and break. SO to me, I think it goes with the territory of wanting a 90 year old gun as a shooter?? I will post the image as soon as I can guys and I never expected such elaborate answers. Thanks to all of you.

BTW, Postino, without sounding like a total idiot, I am unclear of what I am looking for on this image you posted, .I still am going to fire this gun, it works great. Had I had a lot of grease on this area, or oiled good, this might not have happened.