I think that’s just the 97 that has it. This was also sourced form a 16mm print, so it should be a fully authentic mono track.
The mono track on Harmy’s version of Empire is sourced from a 16mm print. The one in Star Wars is a restoration done by an old member here who sourced it from old European VHS broadcast recordings (with some down mixed stereo mixes and soundtrack CDs to fill in missing gaps).
As far as the gunshots go… They should be in the mono track. Here’s what is should sound like compared to modern mixes: