Ok. Lets do math.
M1 Garand + web sling - 10 lbs, 10oz. loaded, on average?
M4A1 (7# 8oz., loaded) + ACOG (9 oz), DD RIS Rail (1#, 1 oz.), AN/PEQ-15 (7.5 oz w/batteries) and forward grip (2 oz?). Makes 9 lbs, 11.5 oz. loaded, with batteries and cool-guy stuff. And now I have optics -...