Do the Gen 4 Glocks in 40 S&W have better chamber support than the Gen 3 Glocks? I know that the older pistols have "enough" support, but for handloading purposes I'd like to minimize the amount of case bulge I have to remove. What would you do with a Glock 27 Gen 3 with a loose chamber? Put a Gen 4 or aftermarket barrel in it, or upgrade the whole thing to a Gen 4? Or wait to see if there will be Glock 27 Gen 5?