Ummm.... may I respectfully point you three posts (currently) down:
But, in answer to your question here. No, I don't carry extra magazines. My personal opinion, for me, where I live, is that 11 rounds of .45 ACP +P 230 Grain JHP's is enough protection for myself. I don't particularly care if others are disturbed by the object on my belt because the benefits of open carry far outweigh the aspect of someone getting twitchy and calling 911.