![]() Putting the takedown pin in on the correct side, it barely gets in and doesn't budge shortly thereafter. I can almost get it through from the opposite side (I get through to the point where it gets through first 2 holes, but hits a wall and cant get through the 3rd hole (right side takedown pin hole). I tried aligning the two with and without the buffer in, with and without the BCG/CH in, etc. Tried to provide all relevant angles with lighting to show where fouled up contact points might be, where the holes are misaligning, etc. Front pivot pin lines up just fine, but rear takedown pin holes are not mating properly between the upper and lower.įor what its worth, the upper is Aero Precision ( Upper) and the lower is JP Enterprises ( Lower)īelow are pictures of the issue I'm running into. Besides the parts you will need a screw-driver to take the Buttstock off and everything else can be done with no tools.Building my first pistol AR and all has gone pretty well until I was getting ready to mate the upper and lower. When you’re comfortable that the pin is working and will not come loose again you can re-attach the upper again and you’re done!Īs you can see it’s pretty easy to fix the Takedown Pin by yourself. Now slide the Buttstock back on the same way it came off and carefully compress the Detent Spring by butting the Buttstock against the back of the receiver and re-install the screw in the backplate.Ĭheck the action of the Takedown Pin by sliding it in and out making sure it does not come loose and that it freely moves to the locked and released positions. Then slide the Detent Spring in after the Detent Pin. Slide the Detent Pin into the hole you exposed by removing the Buttstock and make sure it is seated in the slot in the Takedown Pin. Insert the Takedown Pin into the receiver with the slot facing the back of the weapon. That’s where the Takedown Spring and Takedown Detent will go. Look on the end of the receiver that you just exposed you’ll see a small hole on the lower right area of the face that is connected to the hole the Takedown Pin slides through. Important: If you still have the Takedown Detent and Detent Spring in place be careful you don’t lose them when you loosen and remove the Buttstock! Remove that screw then slide the Buttstock straight back and off the Receiver Extension tube. There is a Philips-head screw on the Buttstock Pad that holds the Buttstock to the receiver. To install the new Takedown Pin you’ll want to remove the Buttstock. The cost is minimal, probably less than $10.00 for the Detent and Detent Spring. These can usually be had in a set from a local gun store, gun show or on-line. 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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