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Thanks for the info I was not making that PI marking out till you said that. upon further inspection I have a type IV PI slide that could be correct for the rifle. no part number stamped on the...

I think I got the pictures figured out. The rifle is an early IBM serial number 3690972. should have a type 3 slide and type 1 rear sight.

I have a IBM carbine that is very original. The rear sight base is correct but looks like the flip sight has been replaced with a single leaf flip sight. Possibly from a later version. And the type 3...