thinking about switching out my g20 for a glock 29 but i have a couple questions. #1 will the aftermarket kkm barrels work in a gen 4?? #2 how much am i going to lose on accuracy?? if you have anything else i should know between the 2 your responses would be greatly appreciated. i plan on using it for one of my ccw guns but would also be carrying it as a hunting sidearm so i will be using full power loads in that case.