I recently acquired this lower (which I assume is a "Navy Lower") that I have no use for and was wondering if there is any way to determine the make and value and what it will work on. I was told that it would fit a 91/G3 or Cetme. The trigger activates the hammer in the two firing positions and the safety works. There are 3 inserts or detents for the selector switch. It appears to be barely used by judging the condition of the internals and outside. Any help would be appreciated. Thanks in advance!