Dear Campbellbook, I do not have a book here to reference. Looking at the photo of the three rifles on the previous page, with two NRA Sporters and a M1922, the rifle in the middle has a longer (READ: taller) Lyman sight. I am assuming, therefore, that is the Lyman 48S ("Which one doesn't look like the others"). Then the ones on the top and the bottom are the NRA sporters since they look the same sight-wise, and the one in the middle must be the M1922.

Looking at my sight, it appears to have the shorter Lyman sight, so it must be a Lyman 48C?

I have no idea what a "turn-down peep" is. Can you educate me?

Here is another pic of my rifle.

Sincerely,
Mark