I liked the cop group argument -- 10 rounds is enough for YOU lowly citizens ..
Many cops did personally write in opposition to the ban
And I can recall when the army compared the 1911 v. 92 handgun examination that the tipping point was the extra rounds allowed for better mission survivability. There were no facts supporting the ban back then and there are still no facts supporting the ban. Only facts supporting more ammo and an increase in survivability ...
Its a no brainer. More ammo in mag = better able to defend yourself.