I have had a few shooters contact me and question the physical size of the SUREFIRE MAG5-60 magazines. Not knowing the answer myself I ordered one for myself from Brownells. The images below of the SUREFIRE MAG5-60 are being referenced to a 30 round magazine.
As you can see the SUREFIRE MAG5-60 for obvious reasons is longer than a standard 30 round AR-15/M16/M4magazine. Thickness wise it seems to be roughly about the same thickness as two magazines side by side. While expensive if the SUREFIRE MAG5-60 proves reliable it might prove to be a suitable replacement for those who use magazine couplers as well as those in the field who require faster and less frequent magazine changes.