I like light ARs and I came across this chart. Thought it might be helpful for others trying to cut the oz's.
https://docs.google.com/spreadsheet...AyqSpKs1KP4/pub?single=true&gid=0&output=html
https://docs.google.com/spreadsheet...AyqSpKs1KP4/pub?single=true&gid=0&output=html