Hey all, noob here. I'm new to glocks but grew up hunting and shooting. With my father being a LEO I've shot my fair share of handguns but mostly i shoot hunting long guns. I'm getting my CCW and a friend of mine has a G19 gen2 he is going to give me because he does not want it anymore. This gun will be coming to me third hand, (as in he bought it used off the guy who bought it for his duty pistol). Anything i need to look for, replace, or otherwise keep an eye on? I have no clue as to how many rounds have been put through it. Thanks for the help.