I had/have extended mags for my Ruger and Taurus pistols. I never use them because they're such a pain in the ass to load. They're there for emergency use. 
Exactly CJ. Plus they were only $20 a piece. (For now),....Sure they're big, long, and 45ACP to boot, (heavy)....BUT they are legal, bought by someone, (me), who will unleash hell on produce, bowling pins, water jugs, and in the event of an "emergency",.....
just have an extra 20 rounds, without reloading.
