Originally Posted by Drake
It's like a normal M4A1 except with an 11.5" barrel (old style stock, M4 handguards).
It's since been superseded by the Mk18 mod 0 and mod 1 (CQB-R)
edit: based on the description it sounds more like it was an NCO/Officer weapon (i.e., people not usually assigned a rifle). MFR operators usually carry a 1911 (MEU SOC 45).
Huh, I thought CQBRs are for Force Recon's CQB Operators while the Mk18 was exclusively Navy. Has it also replaced the M4 Commando with (Force Recon's) Company staff as well?