Thank you for the response.

This is what I am trying to learn about my new piece.
It has an Inland barrel dated 1-44.

Not knowing anything about IBM, my query was about learning what is supposed to be on this rifle.
It does have an adj. site, and very, very firmly attached

Someone responded and said that only about 16 parts were made by IBM, the rest supplied by others? All one supplier, or numerous vendors.