A used gun is a super good value, however, you need to touch, feel, hold and be able to break down the weapon. Start by visiting a gun range or make/visit with reliable and firearm knowledgeable friends. Don't be afraid to ask questions and learn. Most folks will let you shoot their firearm. The benefits are, you learn about a firearm and then your able to apply your knowledge to your firearm purchase, very important if your buying used. I just purchased a Glock 23, 2004 used model. I inspected, look and felt just like a Glock. Took my new to me Glock home with a grin from ear to ear. The next day I took it apart and found a broken, trigger pin, bent trigger pin (long), and a broken locking block. It was immediately fixed and trigger springs and springs upgraded. Make sure you know what your purchasing, and look here with regards to recalls, good source.