Well, this is one of those issues that leads to heated discussions, so let’s start with my position:

The 5.56 round is just find, and any lethality issues are an artifact that the barrel on the M4 carbine, at 14.5 inches, is too short. The M-16 with its 20 inch barrel does not have the lethality issues.

The solution is to replace the M4 with a Bullpup design with a barrel length of at least 18 inches.

Such a design will still be shorter than the M4, and hence easier to handle in enclosed spaces, such as city warfare.

I would also go with a piston arrangement, as opposed to a gas tube, which to bring too much fouling.

‘Nuff said.

In any case, the Army is now looking at an M4 replacement, and is considering going with something like a 6.5mm or 6.8mm round.

This has all the hallmarks of a fiasco to my mind though. They are bidding a new weapon and allowing for a new caliber at the same time, which means that they will not really be able to compare apples to apples.

It should be interesting on the boards for a while though as various gun religions engage in Jihad.