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Posted: 11/13/2002 3:15:23 PM EDT
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I bought a preban lower reciever. It is my first AR. I purchased a new complete upper. The I fired it twice. I noticed the collapsable stalk needed to be screwed on tighter. I have bought the appropiate tool will tighten it. My problem is that some how I lost the buffer retainer pin spring. I bought a new spring and pin. I put them in. They will not stay in the hole. What am i doing wrong? When I charge and dry fire the weapon the buffer blows back and the retainer pin and spring "pop" up and out. Can any one help please. Thanx James |
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When you install the receiver extension (tube), press down on the buffer retaining pin, and then screw the tube until the tube end presses against the center post of the pin. Then back out the tube only enough to index the stock to align with the receiver. The receiver extension (tube) keeps the retaining in place by applying pressure to the retainer flat just past the inner post. It sounds like you have backed the receiver extension too far and the tube is not retaining the retainer. If you have indexed the tube per spec, and it still releases the retainer, due to bad thread index, then you will need to remove a little metal of the end of the tube to allow the stock tube to slightly thread past index, then be backed up to index with enough metal of the tube overlapping the retaining pin to retain the pin. It is not common to have to do this, but due to some parts just being so far out of spec, you may have to either fit the new stock, or send it back for replacement. Here is the repair manual if you need it: old.ar15.com/books/TM9-1005-319-23.pdf Hope this helps. |
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Could you elaborate more what is meant below by "index the stock to align with the receiver." and "index the tube..." Thanks Chris Then back out the tube only enough to index the stock to align with the receiver. The receiver extension (tube) keeps the retaining in place by applying pressure to the retainer flat just past the inner post. It sounds like you have backed the receiver extension too far and the tube is not retaining the retainer. If you have indexed the tube per spec, and it still releases the retainer, due to bad thread index, then you will need to remove a little metal of the end of the tube to allow the stock tube to slightly thread past index, then be backed up to index with enough metal of the tube overlapping the retaining pin to retain the pin. It is not common to have to do this, but due to some parts just being so far out of spec, you may have to either fit the new stock, or send it back for replacement. |
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To index, I mean to have the butt stock inline with the receiver (parallel). The easiest way to do this is to pull the just the butt stock off the tube (receiver extension). Grab the slide release and pull the complete lever away from the butt stock. This will lift the detent pin over the slot and allow you to pull the stock from the tube. Once you have just the tube sticking out the back of the receiver, you will see that the bottom of the tube has a flat with the detent hole to allow the stock to be set to different lengths. If you're like most of us guys, you want the stock to be straight with the receiver. This is called indexing the tube to be parallel with the receiver. But, if you decide that you want to shoot the rifle ghetto style (sideways), you could index the tube to have the stock 90*, in reference to the receiver. The choice is yours. P.S. Keep in mind that on a Car stock, the retaining nut is what keeps the stock/tube from rotating. You set the receiver extension (tube) to the correct depth to retain the buffer retainer, that back the tube off only enough to remove any canting. On a standard butt stock tube, the tube is just tightened, then the butt stock installed. On a standard tube(receiver extension), you do not index the tube , only tighten it down. |
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