A Vietnam veteran came to Don1's office for back cracking a few days ago. They discussed this issue. He pointed out that most LMG were in the ground at about eight inches. In contrast a tripod MMG/HMG was at most 12 inches off the ground. Except if you are firing down a highway there are normally substantial variations in height over any long length of open ground. Three hexes is 120 yards. The VIetnam veteran thought that the house rule restriction of 3/5/7 for fire lanes for LMG/MMG/HMG was generous. Tim