I know I'm posting reeeeeeally late, but I've been trying for what feels like months to get the pieces of Michelle's ex-BF's gun and can't find anything beyond the first one.



Any help would be much appreciated.

All three pieces should have been collected in the one mission, each piece involves a different combat. I might be slightly off as it has been over a year since I last played, but I am pretty sure that was how it went. So you may need to redo that mission if you didn't get all three pieces.