Up here, we are allowed to have "oversize" magazines as long as they are "permanently" blocked to 5 rd for semi-auto rifles and 10 for semi-auto handguns.
Down there, in the states like CA, NJ, NY, MD etc that have capacity limits, are you not allowed to have the "normal capacity" mags at all, or are you allowed to have blocked to 10?
We used to have no capacity limits for rimfire, but after someone made a handgun out of 10/22, everyone who owned 10+ rd mags for their 10/22 rifles suddenly had to block them to 10.