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Lewisite
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Posted: 4/11/2012 5:30:03 PM

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Alright, so let it be known that I am a complete newbie when it comes to everything except basic cleaning of my AR-15, go easy on me I am trying to learn.

Long story short, I installed a Magpul ASAP plate on my AR-15 about thirty minutes ago. First things first, when I loosened the locking nut and removed the receiver extension tube, the spring popped out and it was pretty deformed. I am not sure if I did it when I was uncrewing the plate (possible) or if it was already like that because it was pretty warped on the end of the spring as well, but regardless it was messed up. Once I had the ASAP on I got the (warped) spring back in and the Magpul seated properly. Had an absolutely terribly time with the locking key (as many do it seems) and ended up just installing it without for the time being as this had took over an hour so far and my fingers were really getting tired from holding that plate in place. So my questions are as follows.

1. I was going to buy another take down pin detent and spring since mine is so warped (even though it seems to work). Are these universal? I have a Daniel Defense M4 and I was looking around and do not see many different specifications for different springs and different manufacturers.

2. What exactly am I running the risk of by not having the locking key in the ASAP plate? I intend to go back and fix it, but I could not get the little thing in there. I actually managed to get it in the hole, but it was still sticking out a bit and would not go all the way in, screw in, or anything. Could I have done something wrong putting the plate on to not let it be seating all the way in?

3. When putting the putting the extension tube back in and screwing it around until you hit the buffer retaining pin, is there a certain marking or indication of when you should stop? Or how about with making sure the stock is aligned before you tighten the locking nut? I just pretty much did it all by sight and what looked and felt right since I imagined it was not rocket science. I just wanted to make sure I was not doing something dreadfully harmful to the rifle in the long run.

I test fired it after I was finished and it all seems to be working fine. I have a feeling that locking nut is crucial to eventually get on there, but I just got irritated at the moment. Thanks for the help in advance guys!
PropDoc
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Posted: 4/11/2012 9:37:45 PM
Yes, detent springs are "universal). If the detent is working (locks in place) then no real worries about a deformed spring, change it next time the stock is off....or not.

The locking keys come in two sizes (commercial and Mil-Spec), make sure you are using the correct one. It keeps the ASAP from turning under sling tension, and loosening your castle nut. It should be installed.


The buffer tube should be screwed in until it just passes over the edge of the retainer, but should not touch the center pin. It is what holds the buffer retainer in. Stock alignment is the other job that the lock pin in the ASAP helps with. If it is "eyeball" straight, no worries.

You will not do any "damage" to your gun, but may end up with a loose stock after a little while at the range. A loose stock could mean i rogue buffer retainer, that could end up in the fire control group, and put a stop to it. Then when you pop the rear take-down pin and pivot the upper to capture the rogue buffer retainer, the little bastard will have set a trap for you, as the buffer and spring unload from the buffer uncontrolled. If i were you, i would fix it.
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