I'm doing a little research on the Model A UZI receivers and would like to poll you guys for some data. The earlier Model A receivers were actually made from Israeli SMG receivers and the front sling swivel on them only rotates 90 degrees.
That would have been made in 1981. Except for the sling swivel rotation being restricted, the receiver would be the same as any others. Any changes to things like sear holes would have been done as part of the full auto conversion.