I'm curious about aftermarket G20 barrels with better case support, always looking to be safe and shovel more into this moneypit of a hobby . The IGB seems interesting, though pricey, advertising drop-in fit and "fully supported" chambers. My interest is more in minimizing bulging brass than a tighter barrel. I've seen commentary here on most of these barrels individually, each seems to have its own relative merits. My questions are: 1) Has anyone tried more than one of these, and is willing to compare them? 2) What tradeoffs are associated with fully supported chambers? I assume that feeding reliability is the reason Glock makes there barrels as they do, so does fully supported mean less reliable feeding? This would be for a target and range gun, not for combat or carry. Thanks.