In order to fix this you need to get a new Takedown Detent and Takedown Spring, provided you haven’t lost the Takedown Pin. The groove on the Takedown Pin holds the Takedown Detent in place and prevents the Takedown Pin from being separated from the receiver and getting lost. ![]() It does this by pushing the Takedown Detent into a groove that is cut into the shaft of the Takedown Pin with the Takedown Pin Spring that is embedded in the receiver. Since the Takedown Pin is spring loaded it is designed to stay attached to the lower when released. If you lose the Detent and Spring you can still fire the weapon but you risk having the Takedown Pin come loose while in the field. It usually pops out if you take off the stock without knowing there’s a spring loaded pin held in place. It is fairly easy to lose the Takedown Detent and Detent Spring. ![]() It’s a pretty simple 3-piece mechanism that usually works well to allow you to push the pin out far enough to release Upper without letting the pin separate from the weapon and get lost. The Takedown Pin is located above the grip and is held in place by a small pin and spring, called the Takedown Detent and Detent Spring, which are hidden inside the Receiver. The Takedown Pin on an AR15 rifle is the first pin you push in when you want to separate the lower receiver from the upper.
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