I don't mean to sound pedantic but most of the mags which would be banned if they pass a 10 round limit would not be 'high capacity', they would be standard capacity.
The AR was originally designed with a 20 round magazine and the 30 rounder has been standard for decades. The same goes for most other semi-automatic firearms. The original Glock, for example, came standard in 1982 with 17 round magazines.
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