The XM5 weighs 8.38 pounds, or 9.84 pounds with the suppressor, much heavier than the 6.34-pound M4. That new rifle will also use 20-round magazines, smaller than the 30-round magazines troops currently use.
A soldier's basic combat load will be seven of those 20-round magazines, a total of 140 rounds, weighing 9.8 pounds altogether.
The M4's combat load, also seven magazines for a total of 210 rounds, is 7.4 pounds.
In total, a rifleman with the XM5 will carry roughly four pounds more than today's M4 rifleman.