You asked if the "Gunga Din" film was the full length version. Unfortunately, it is not as I just screened it tonight--even though it was described as such!
Total run time is about 90 minutes--so this must be an abridged/edited version as I believe the full length version is 117 minutes. Since I thought I was buying the full feature I will need to return this one. I am not certain who released this edit---it simply has the RKO Radio Pictures opening but I did not see any other identifying marks.
It is in nice condition, but has a slightly soft focus and the sound is not as clear as I would like either.