Oh, I forgot-
Thanks for the link to the manual, DBAR. Me being me, I monkeyed with the thing last night. I studied engineering a little bit and I'm a good amateur mechanic. I like to see how things work.
I was playing with the take down, trying to figure out how a faint rub mark was at the 8 o'clock position. Then I saw the pieces mated to the inside of the frame with the take down lever bar. Interesting...but I left it alone. I was remembering the time with my 1911, when a week after I got it I decided to swap triggers and shot a spring across the room...which I did'nt find for two days!
Well, long story short, I took out the SIG take down lever to see if there was a bur or something on it, and I also polished up the rub mark a little. So I appreciated the link to the manual a lot- 'course, it didn't tell me how to put the take down back in...wasn't that hard, that stuff never is too tricky. But now I see exactly how somebody once tried to put it back it wrong, and made the rub mark I polished out!