I have a buddy who is a Marine. He carries the full lenth M16 with the 20 inch barrel. He said the Marines don't issue the M4 except to special units or people who need a shorter weapon. When he was in Iraq he said they never had problems with the .223 out of the 20 in. barrel. He believed that the velocity lost out of a shorter barrel is the problem and the issue ball rounds. They need better rounds and that will solve alot of problems.

Just my opion thats all. Not trying to start any wars. I have seen topics on .223 and AR vs. AK's on other sites cause quite a stir.