I am new to this forum but I came here to post situation with my brand new Glock sub 2000 gen 2. This is a warning to anyone who is considering buying a sub 2000. I had been considering buying a sub 2000 for years. Did research - and for the most part everything I saw or read said that the sub 2000 was good to go except for some cheaper parts that could be replaced with better after market parts (Mcarbo). So when I saw them at my local dealer I decided to pull the trigger and get one. I looked at a total of 3 guns at the dealership. 2 had canted sights right of the bat, but the 3rd seemed to be ok. So, I decided to go and purchase then gun. I took the gun home and said... Time for some Mcarbo parts! - well... after ordering almost 400 dollars in Mcarbo parts - I said to myself... Now you are in this little gun at to high of a cost - but what the heck... It will be nice when it is done. I once again smiled to myself and picked up my sub 2000 when I noticed something wrong with my new gun. It had vertical movement up and down when the rifle was in the extended and locked position. Now the horror of what I just purchased set in..... A piece of junk. I searched the internet and found at least one other person who had this issue. Some of the advise said to make sure the barrel nut was not loose. So I took off the barrel fore-end stock and guess what I see? A tight barrel nut that is Broken (top half of nut gone). Obviously some brain damaged individual put this gun together. Now the second horror hit me..... Kel Tec does not have Good QA and one or more of their employees does not care about the quality of their work, nor the possible danger that could result from a defective build. So, after a few moments of buyers remorse... I decided to call Kel- Tech on a warranty repair. The first thing I told their tec department was that my brand new gun was defective and the barrel moves up and down when locked. Before I could even get time to tell the guy about the broken nut..... I was told, " There is nothing wrong with your gun... All sub 2000's are suppose to do that! ". This is when the 3rd horror hit me... This Kel Tec guy is a severely brain damaged individual and now I have to eat a bad gun. Well, I decided to hang up on this guy and call again to see if I could get a different individual. The new person I got in contact with almost told me the same exact response, However... I was able to this time tell him that the barrel nut was broken. He said if the barrel nut was broken to send the gun back for repair - but he could not promise that the barrel lock-up movement could be fixed. Now, This is my story and warning to all. If Kel Tec was ever a great company.... Those days are long gone. If you decide to purchase a sub 2000 or any other Kel Tec gun, better make sure you take a long time inspecting every bit of the gun and if you have to call for warranty repair - you might be in for a rude awakening.