Kinda new to this but looking into getting a Glock, probably the 19
Go to a range where you can rent different makes/models out to try before you buy. Go with the model that shoots the best for you. 4" which the 19 is, is about as short as you'll want to functionally go. Longer barrels have longer sight radiuses which make them easier to aim. Small discrepancies on a short radius translate to much bigger errors than they do the longer you go, hence why rifles are considered to be weapons of accuracy moreso than pistols. If it's going to be a range toy, don't be scared to go longer. Concealability wise, barrel length is also a smaller factor than overall width and the length of the grip.
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