4 grams is the bullet weight but the full cartridge is 12 grams. So, 100 rounds would be about 3 lbs.
A basic M4 with the Surefire 100 rounds mag would weight about 10 lbs.
bruce: Team Bad Karma-(BK-05)
: Special Battalion East-(SBE-01)
Last edited by bruce; December 16th, 2013 at 02:03..