[IGOTMINE]

There is a reason the FBI HRT, etc. transitioned to the M-4 from the MP-5....penetration. At short range, the 5.56 won't reliably penetrate sheetrock without a lot of fragmentation.

At the ranges that count, the 7.62 holds together and goes through things and into people, which is good because people tend to try to hide behind things.

[yarddog]

I don't guess I understand. The M-4 is a 5.56, the MP-5 is a 9mm although I think they also make them in other pistol calibers.

The real complaint against the M-4 is that it OVER penetrates. Those long heavy 69 grain bullets go right through without doing much damage.