The only difference between a Colt 7.62 mag and a 20rd Colt 223 mag is the floorplate is marked 7.62X39.
Other than that they are the same exact mag in all respects from the ones I've seen and handled.
I'm not saying how many mags a magaholic like me owns.
Uh uh no way.
I pretty much will use any AR mags 'cept the Orilites.