Since up until recently all the magazines were imported and range from late 1950's production to 1990's I'd say no. They're only preban if they were imported prior. The ones imported after will be more or less identical to the ones prior.
Steyr magazines were produced in the 1960s, they were designed with witness holes on the rear of the magazine so that a rifleman could glance to see a rough count of the rounds remaining. To my knowledge no other magazines utilized this design feature.
The above link references, new for sale magazines on the FALfiles. Not my magazines, nor do I have any relationship with the seller... other than being a member of the FALfiles.
Good luck and HAPPY shooting.
Originally Posted By USMC223:
Any way to positively ID pre ban metric mags?
All military surplus F A L magazines are pre ban. According to the now defunct AWB, surplus magazines that were NOT dated before passage of AWB were considered pre ban. Those with dates of manufacture on or after passage are not pre ban.