What the heck is this?

[ithacaartist]

I haven't looked for the discussion from two years ago, but I'm pretty sure I joined in on it...

Anyone else remember that discussion???

Rich, I remember that discussion, having read it last year after my naissance into Lugerforumdom, when I was reading everything here. I'm surprised I didn't recognize it from then, it is so distinctive. I don't recall specifically any discussion about how it is actually mounted to the gun.