Please do not take a part any weapon you buy unless you do it in front of the person you bought it from. I sold an AR15 today and they guy thinks he is an expert and took it a part stripping the buffer tube. I made him do a complete check and a functions check. If the buffer tube and grip was loose he could not have done this in front of me successfully. He called me up and told me he took it a part and the tube was loose. In no way was it loose when I handed it to him and we both checked it together. He is trying to get something for free. I also made him sign a receipt stating that he checked said weapon and was happy with it. In the future make sure that the people you sell weapons to understand that if they play doctor with the weapon that they bought it.