Quote Originally Posted by William F. Owen View Post
1. The performance of 5.56mm is always up for grabs. I judge SS109 derived rounds to be pretty good, for suppression and engaging targets in the open. If I want to punch up some cover then 7.62mm or HE is a better choice. All very obvious.

2. I wouldn't even try to maneuver a GPMG or Sniper rifle in CQB, except as part of a 3-5 man team and supported by another team doing the recce. EG - Recce team clears the building and then calls up the weapons teams so as they can use their weapons against the enemy in the next building.
I'd think the obvious problem with what you suggest would be the non-linear nature of urban combat. Sooner or later, the "whackamole" pops up where you don't expect him.

To be sure, I'm playing "devil's advocate" here, but I've heard from some folks who've used the admittedly problematic M14 to good effect in towns to punch through barriers using reflexive fire in CQB.