It is a Marble, part number 009805.
Brownell has them for $133 retail, $92 wholesale.
Here's the Marble link.
http://www.marblearms.com/standard-peep-tang-sight.htmlMay want to shop around, sometimes things pop up on EBay. But you gotta know your product and price or you could get snookered on Fleabay...
I've seen a bidding war blow way beyond where it should have.
DF
