Picked up a brand new G17L at a gun shop today and trying to understand why I'm having all sort of issues at the first range trip. FTF, Stovepipes, slide won't lock open after last round. 17 malfuctions on the first 20 rounds on the gun...talk about Glock reliability! Any idea on what the problems maybe? I have never cleaned any of my past glocks out of the box (17, 19, 34) and they always shot reliably. Haven't cleaned this either and the thing is just a disaster.. Ammo is WWB which I have in thousands of rounds, so I hope it's not the problem. Should I just contact dealer and Glock USA and send it back? Seriously discuraged right now, as it wasn't a cheap gun..