Installing pivot pin detent and spring

You'll find that it centers itself fairly well on the spring. Incidentally, just like with the detent springs, some manufacturers do supply a third detent as a spare in case you lose one by launching it. Note, for later in the article, the pointy tips of the detent. This will be relevant later. Carefully press straight down on the detent, using the front pivot pin to push it in. If you're not careful, you're very likely to have the detent slip past or go sideways, and send the detent and spring after it flying up into the air.

Some folks choose to do this step inside of a large, clear plastic bag in order to contain any fleeing parts. Once you've gotten the pivot pin down into place, exert a bit of sideways pressure so that it locks into the large loop in the front of the receiver. Then, align the opening in the tool with the detent hole in the reciever. Next, push first the spring and then the detent through the hole in the install tool, into the receiver.

The detent should stick out of the tool, due to the spring pressure behind it. Use the second Install Tool to push the detent into the recevier. Rotate both tools, so that the install tool is no longer ligned up with the detent. Pull out the pin pusher and set it aside. The most imporant part of this process is to position a finger, as shown, opposite the detent. Pushing down to counter the pressure of the spring is the trick to this whole process.

Then use the pivot pin to push the install tool out of the receiver. Same spring. In fact, pivot pin spring and takedown pin spring are the same, AR and. Same one. In the pivot pin, it doesn't go all the way in - the detent sticks out. You need to compress it with the pin, or compress it to get the pin in there. It can be tricky. Attempt to assemble it inside a 1 gallon zip-lock freezer bag - because when the thing shoots out, it won't go far If you attempt to assemble it uncovered, and it shoots across your room - you will never see it again Tell you what - have you assembled the takedown pin yet?

Use the takedown pin to assemble the pivot pin, then put the takedown pin in. It was way easier on my 15 everything went smooth, this one just wont compress down. I tried but then gave up becuase i started thinking of cerakote or some coat of some sort lol.

I've been lucky to find the detent once or twice what i havent found is an old bolt catch pin lol. Check the detent pin without a spring in there, first - if that thing won't go in the machined hole for it, you might need to employ some small drill bits and "fix" that hole a little bit. I'll have to inspect that, just seems like the spring gets compressed all the way and that why it wont go in any more. Ill double check. Might be a "machining problem" on the lower, then, if that hole isn't the proper depth.

I don't have an unassembled lower on me right now, or I'd measure it for you - someone here has to have one, though. It's gonna be the exact same depth on a. I'll get a measurement back in here before the clock strikes I can take some additional pics, then, and show you how to get that thing together easier Could you be trying to install the stiff safety detent spring instead of the front pivot spring? The front pivot pin and rear takedown detent springs are the same but the safety detent spring is different.

That is the one that fits in the grip. It is significantly stiffer than the other two springs but I think it is the same diameter and length. Safety spring is larger in diameter Won't fit in the detent hole, unless the machining was bad and that hole is huge.