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 slide has been replaced and I think it is a type 4 or 5. I was hoping some one could identify it? And is it worth finding the correct parts to make it all correct, type 3 slide was weaker and possibly why it was replaced.i will post pictures as soon as i figure out how.
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