Quote Originally Posted by Bill Hollinger View Post
It all depends. There are a lot of counterfeit rear sights out there. If it is from Modesto, CA it is fake. Close up, in focus, macro photos of the sight and we'll be able to tell.
Here ya go! M1 Carbine Flip Sight Marked RP/R P for IP - eBay (item 260701768073 end time Dec-08-10 17:09:40 PST)