I'm thinking about getting a 10mm Glock to add to my collection. I read the description on the Glock website not much help. Where does the short frame show up? and what's compensated? Is the "C" model ported? The "C" model is no longer being made, but there's new old stock available. I live in the Calif. nation so I can't buy the 4's and 5's. The "SF", and "C" models are on the Calif. roster. What's the difference between these two pistols? This won't be a carry gun, range, and HD. Thanks GT