Real or Fake ?

[MCWepps18]

This owner and I are going back and forth with offers and counter offers for his IBM. He finally sent these closeup pics of the Rear Sight and I might have a limit now on my offers to this Very Nice I cut High Wood IBM. I was going to give into his last offer and just buy it on the High Side, but now looking at this Sight I'm confused about it being Real or Fake....What do you think ?343993440134400

[Tuna]

The IN B was only used on early production IBM carbines. If your carbine is in the 3.6 million range it would be right for it.

[Newscotlander]

IMO, that rear sight is not original. It looks like the West Coast/Minnesota repros.

Here's a IN-B flip sight on a 3720391. A little later than 3.6 mil.

http://img.photobucket.com/albums/v116/TheFox/3720391/DSC_0154_zpstq8eglcb.jpg
http://img.photobucket.com/albums/v116/TheFox/3720391/DSC_0152_zpsjy6rhgaf.jpg