I carry a g45 with a rmr awib with zero issue and in a t-shirt most of the time. Las concealment holster, super comfortable, no printing, very comfortable. I also carry a g42 sometimes. Mainly if I’m going for a run or something where I don’t have a belt but honestly with a good holster they carry the same. Get what fits you comfortably and go shoot regularly, that’s how you will get good at distance, not because of minor barrel length difference.