At the start of TTK I had around 1200 weapon parts now I am down to just over 100 and need to upgrade 4 weapons so really I have none. I know I used a couple hundred on rep when the drop rate was up but if I knew that would change I would have never done it. My biggest problem with Bungie is their habit of changing mechanics without a heads up. I understand that they do not want people exploiting things they are about to change but in this case and it others I was using the system in good faith and now I am in a bad position due to an unexpected change.