I have read quite a bit of peter Kokalis' stuff on machineguns in SAR etc and found it quite usefull. Always try to remember it is just magazine journalism and not intended to be highly technical or always please the purists.
Here is Kokalis in his own words . seems he is largely a photo journalist with some military experience . No mention of him being a "divorce Lawyer"
http://www.cameraquest.com/combatph.htm