I have been shooting , and reloading for quite a few years , but I am new to shooting , and owning Glock handguns ? Because I reload I want a barrel with a fully supported chamber , when I go to the range . If I decide to carry any of my Glocks I will change out the aftermarket barrel for the stock Glock barrel . In the aftermarket barrels who has the best supported chamber ? I have a KKM barrel for my G 29 Gen 4 , but I haven't had a chance to take it to the range yet . I have a Glock 27 Gen 4 that will be my EDC , so I want to get a lot of range time that one .