Ok gents to solve a debate that I've read before but just happened to have the tools to solve. The difference in weight between an open CK Arms Hardcore, and CK Arms Thunder, slides. And I threw my STI DVC limited in for fun.
Here is what I got:
Hardcore: 11.4oz 326g
Thunder: 11.2oz 319g
DVC-L: 12.3oz 353g
All of these are 9mm, not that it would matter, measured on the same scale. Same day/time. These slides were not stripped so they had firing pins/block, extractor etc. Installed. So as equal as I could easily make it. And excuse me if my grams to oz isn't exact I just read the scale.