How much shooting can these guns withstand? I've always heard that alloy frames were useful for guns that you carried a lot, and shot a little. Well, how little? I'm not planning on doing IPSC matches, or putting 10,000 rounds a year through it, but I generally shoot about 100 rounds every couple of weeks. Would I be better off going with the steel frame with this kind of schedule, or would the alloy frame hold up just as well?