Neither do I, but if you think about it, it seems like a shabby reason to carry a light weapon into a CQB. Best just not to shoot the friendlies! After all, most people mistakenly shot by 5.56 are not doing too well either.
In R. Lee Ermey’s special last night, he offered this defense for the 5.56 mm
When you shoot someone with a 7.62 mm, you kill him and just take one guy out.
When you shoot someone with a 5.56 mm, you wound him and take three guys out, the guy wounded, the medic treating him, and the guy who has to carry him off the battlefield
Sort of an academic exercise, and reminiscent of the horrible “body count” approach that was woefully used in Vietnam (thanks to McNamara and his Whiz Kids), but somewhat interesting
I think a mid size cartridge like the 6.5 or 6.8 would be good for the new carbine