Help... bought Magpul PRS stock but need to change buffer tube?


PDA






DefiantDad
June 13, 2012, 09:13 PM
Hello! That .45 v .223 thread sure was interesting, but now I have a more mundane and pressing issue.

Like a "newdiot" I went ahead and bought that Magpul PRS stock for my AR. The stock has adjustment for cheek weld, which is what I found was lacking in my last time at the range; my eye level with the various sights was not optimal (a couple of different scopes, and a red dot).

So anyway, turns out I need to swap the buffer tube. My AR currently has the Magpul MOE stock, collapsible, with the buffer tube that has the number markings and a notched rail on the bottom. Apparently I need another tube with no notches.

I don't want to just take this to my LGS gunsmith and have him do it for me. The whole point is that I want to learn about my AR and this does not seem to be overly complicated (or is it?). Seems I need a wrench tool of some kind to remove the buffer tube and put on a new one?

Also, I don't know what new buffer tube I need to get.

I tried searching for video tutorials, etc. but found nothing. They only show how to change the MOE stock to a CTR stock, which is basically the same thing, and one guy who supposedly was showing how to change the buffer tube ended up showing nothing except talking about some cheap tool he bought off eBay. So, no help there.

Your advice appreciated. Thanks.

If you enjoyed reading about "Help... bought Magpul PRS stock but need to change buffer tube?" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!
TurtlePhish
June 13, 2012, 09:25 PM
Look for an A2 buffer tube. Any M4 stock wrench should work, almost all that I've seen have a cutout in them that fits the nub on an A2 stock as well. Just take off the castle nut on the current tube and unscrew it, then put the A2 tube on. Oh, you'll need a rifle buffer too. You can buy kits that come with the tube, buffer, and spring, though.

DefiantDad
June 13, 2012, 11:17 PM
Thanks. ALso LGS guy had mentioned a tungsten buffer? Not sure if that is good/appropriate for my purposes here?

TurtlePhish
June 14, 2012, 09:35 AM
Those are for carbine tubes, just use a standard rifle buffer.

dom1104
June 14, 2012, 09:49 AM
You will need a rifle buffer, a rifle spring, and a rifle tube.

The best quality one I have used, and the only one I will now use is the BCM.

http://www.bravocompanyusa.com/Receiver-Extension-for-M16-Rifle-p/receiver%20extension%20m16%20rifle.htm

It is polished on the inside of the tube, not rough finished, and that makes for a very smooth charging handle pull, and of course less friction in general.

Its very VERY noticeable.

LegalAlien
June 14, 2012, 02:38 PM
Don't forget about the end-plate behind the Castle nut/buffer tube.

The moment you losen the castle nut and the end plate separates from the lower receiver . . . . . you have the takedown detent spring and takedown detent potentially escaping and going flying through the room. :what:

Make sure you have a method to keep these niggly two little items from taking off.

Also, when you tighten up the replacement buffer tube and castle nut, it is imperative to ensure that the takedown detent spring does not get folded/bent in the process.

Just sayin . . . . . . . . ..

DefiantDad
June 14, 2012, 09:48 PM
Hmmm, starting to seem complicated. Dang.

I should have a vice for this right? To hold the Lower receiver?

What's the wrench type tool I should use to unscrew everything? Is there a high quality one I should just get for lifetime use instead of some cheap eBay thing?

I need to Google around for more diagrams before I attempt this.

I can use my existing buffer spring right? Just get the replacement buffer tube and the wrench tool?

TurtlePhish
June 14, 2012, 10:33 PM
You need a new spring, too. Some tubes come with them. You want A2 parts.

Do a search for AR stock wrench, they'll all do the job.

jim243
June 14, 2012, 11:04 PM
It is not that hard to change out. A few things need to be watched for.

Try this for the proper instructions.

Jim

http://www.midwayusa.com/product/595483/guntec-video-midwayusa-gunsmithing-the-ar-15-dvd

DefiantDad
June 15, 2012, 12:41 AM
Thanks Jim, video looks good but it says it's for the A2. Will that be OK? I have the flattop with the rail, no carry handle. I assume everything else is the same except for that?

ilivas
June 16, 2012, 12:28 AM
I just ordered the same stock for my AR.

http://img.photobucket.com/albums/v634/ilivas/8a3bc272.jpg

I ordered this one. Works great.

http://www.JoeBobOutfitters.com/A2_Rifle_Stock_Completion_Kit_p/brn-080-000-554.htm

DefiantDad
June 16, 2012, 04:31 AM
Great! Thanks. How do you like the PRS?

TxBobS
June 16, 2012, 01:45 PM
I use my "multi-tool" for removing/installing the castle nut.

http://www.homebrewers.com/product/20B03-125/Faucet-Wrench.html?meta=dealtime&metacpg=20B03-125&utm_source=SHOPCOM&utm_medium=CPC&utm_content=&utm_campaign=20B03-125

Works on AR castle nuts and also on the kegorator faucet. :)

ilivas
June 16, 2012, 02:41 PM
I like it. It's very solid, and I like the adjustments. The weight also balances out my rifle nicely.

DefiantDad
June 16, 2012, 03:26 PM
I use my "multi-tool" for removing/installing the castle nut.

http://www.homebrewers.com/product/20B03-125/Faucet-Wrench.html?meta=dealtime&metacpg=20B03-125&utm_source=SHOPCOM&utm_medium=CPC&utm_content=&utm_campaign=20B03-125

Works on AR castle nuts and also on the kegorator faucet. :)
Haha that's cool. Does it fit perfectly?

DefiantDad
June 16, 2012, 03:39 PM
I like it. It's very solid, and I like the adjustments. The weight also balances out my rifle nicely.
Good to know. I am going to learn more about AR disassembly first and then do this conversion. The buffer tube seems to be sold out though.

Captain Brown Beard
June 16, 2012, 03:40 PM
Don't stress it too much, they're not really that hard. I personally have had springs and detent pins, and various small metal pieces fly all over my house. It's kind of a rite of passage. Buffer tube swap is pretty straight forward though.

DefiantDad
June 16, 2012, 03:57 PM
Don't stress it too much, they're not really that hard. I personally have had springs and detent pins, and various small metal pieces fly all over my house. It's kind of a rite of passage. Buffer tube swap is pretty straight forward though.
Ya that is what I thought, so I reckon it could be my first little foray into learning how to gradually smith my AR. :-)

ilivas
June 17, 2012, 02:47 PM
Hah, I guess I bought the last one. The one I got was labeled a brownells part though. So I assume brownells would have it.

weeniewawa
June 17, 2012, 03:19 PM
this is why I always tap and put a small set screw into the rear takedown detent hole. makes future stock changes easy.

and when I build lowers for others and they decide to change their stocks, I don't get a call asking if I have any spare springs and detents

If you enjoyed reading about "Help... bought Magpul PRS stock but need to change buffer tube?" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!