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Thread: AR-10 buttstocks

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    krw
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    AR-10 buttstocks

    I have an Armalite AR-10. Will the Magpul stocks for AR-15's also fit my AR-10? If they will, would my Armalite have a commercial or Mil-spec tube? Thanks!

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    ORD
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    Quote Originally Posted by krw View Post
    I have an Armalite AR-10. Will the Magpul stocks for AR-15's also fit my AR-10? If they will, would my Armalite have a commercial or Mil-spec tube? Thanks!
    Couple things...there is no "commercial" vs. "mil-spec" tube as to rifle/A1/A2 receiver extensions/buffer tubes. They are ALL the same.

    If your AR-10 is currently wearing a collapsible stock that came from the factory that way, it is a "mil spec" diameter extension, but an extended length one that will NOT allow and AR-15 collapsible stock body to fully collapse on it because it is longer than a standard AR-15 tube. If you do have a collapsible-style/carbine receiver extension, you will need to remove it, the castle nut and endplate, and the carbine buffer and spring and replace them with a rifle-length/A2 extension with an appropriate AR-10 RIFLE buffer and spring to run the PRS type stocks. If its a collapsible stock for the AR-15, just realize that without swapping to an AR-15 receiver extension and a shortened buffer, you won't be able to collapse the AR-15 stock all the way on the Armalite proprietary AR-10 carbine buffer tube.

    As to the Magpul AR-15 PRS stock...NO, it will NOT work on an AR-10 without modification if you raise the cheek riser even slightly. This is because the AR-15 PRS has a longer cheek riser section than the AR-10 model that extends toward the receiver...with it raised, the longer charging handle of the AR-10 will make contact with the riser on the AR-15 model and not allow you to properly charge/cycle the rifle. Thus...that's why Magpul makes an AR-10/SR-25 version of the PRS.

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    krw
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    Yes mine has a factory collapsible stk. I was wanting to switch it out to the CTR stock. Guess I can use it the way it is. Thank You for the info! krw

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    ORD
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    Quote Originally Posted by krw View Post
    Yes mine has a factory collapsible stk. I was wanting to switch it out to the CTR stock. Guess I can use it the way it is. Thank You for the info! krw
    I didn't mean to dissuade you from making the move to the CTR. A mil-spec CTR WILL work with your current receiver extension, but it will not fully collapse like it would on an AR-15 receiver extension (it'll be ~0.75" or so short of fully collapsing to be specific). This is NOT a big deal unless you really need to run the rifle with the stock shortened up that tight or the aesthetics of the rifle with the stock not fully collapsed bugs you that much. Functionally...the CTR will mount right up and run just fine.

    If you DO want it to collapse fully, you'll just need to swap out the receiver extension to a basic, AR-15 mil-spec tube, as well as move to a special, shortened .308 Carbine buffer like those offered by Clint Butler (a.k.a. - Slash's Heavy Buffers), along with a modified AR-10 carbine buffer spring.

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    Hi all (I'm new around here...)

    Just put on a PRS stock on my 308 and I have an "almost new" Magpul ACS-L left over, including the matching mil-spec carbine extension tube (AR15 length), "short" 308 buffer and buffer spring. I can also toss in a Magpul ASAP sling mount since I no longer have use for that.

    Interested? PM me with a fair offer (parts are almost new and came off my week-old CMMG MK3).

    acs-l.jpg

    ... and yes, it does collapse fully.

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    krw
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    Thank You Ord for all your info. 3/4" from fully collapsing is not an issue with me. Shibiwan, thanks for offer but since you are new I think you have to follow NewBie rules for selling on SH. krw

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    Quote Originally Posted by ORD View Post

    As to the Magpul AR-15 PRS stock...NO, it will NOT work on an AR-10 without modification if you raise the cheek riser even slightly. This is because the AR-15 PRS has a longer cheek riser section than the AR-10 model that extends toward the receiver...with it raised, the longer charging handle of the AR-10 will make contact with the riser on the AR-15 model and not allow you to properly charge/cycle the rifle. Thus...that's why Magpul makes an AR-10/SR-25 version of the PRS.
    Is that really the only difference? So I could use an AR15 PRS on my LR-308 build if I am willing to do a little dremmel work on the cheek riser? (Just thinking it is easier to find a used AR15 PRS... the .308 build is more $$$ than I expected it to be.)

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    ORD
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    Quote Originally Posted by Luky View Post
    Is that really the only difference? So I could use an AR15 PRS on my LR-308 build if I am willing to do a little dremmel work on the cheek riser? (Just thinking it is easier to find a used AR15 PRS... the .308 build is more $$$ than I expected it to be.)
    Yes...that's the difference between the two.

    HOWEVER...in order of my preference with using an AR-15 model on a .308 AR would be:

    1) USE THE RIGHT PART/TOOL FOR THE JOB!! There are AR-10 PRS models out there. If you can tell me what color you are wanting, I may be able to put you on the trail to one so that you don't have a hacked-up stock on your rifle. Trust me when I say that they are pretty fugly when modded in that fashion!

    Just by way of example, here's a couple links to IN STOCK AR-10 Magpul PRS stocks:

    PK Firearms | Online Store (OD Green in stock and ready to roll...look at very bottom of the page...good company that I've done business with for YEARS).

    MAGPUL AR-10 PRS Stock - Black (Black in stock...DSG is one of Magpul largest stocking dealers in the US and they are also GTG).

    MAGPUL AR-10 PRS Stock - Dark Earth (FDE in stock also)

    2) Use a DPMS Buttstock Extender to get you the extra clearance you need (and then some) instead of hacking up your stock. See here: DPMS Buttstock Extender 1 AR-15 Aluminum Matte

    and last and certainly least...

    3) Hack up an AR-15 PRS to work on your AR-10.

    Good luck to you (and again...get the RIGHT PART the first time and avoid the dremel route)!!

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    Quote Originally Posted by ORD View Post
    Yes...that's the difference between the two.

    HOWEVER...in order of my preference with using an AR-15 model on a .308 AR would be:

    1) USE THE RIGHT PART/TOOL FOR THE JOB!! There are AR-10 PRS models out there. If you can tell me what color you are wanting, I may be able to put you on the trail to one so that you don't have a hacked-up stock on your rifle. Trust me when I say that they are pretty fugly when modded in that fashion!

    Just by way of example, here's a couple links to IN STOCK AR-10 Magpul PRS stocks:

    PK Firearms | Online Store (OD Green in stock and ready to roll...look at very bottom of the page...good company that I've done business with for YEARS).

    MAGPUL AR-10 PRS Stock - Black (Black in stock...DSG is one of Magpul largest stocking dealers in the US and they are also GTG).

    MAGPUL AR-10 PRS Stock - Dark Earth (FDE in stock also)

    2) Use a DPMS Buttstock Extender to get you the extra clearance you need (and then some) instead of hacking up your stock. See here: DPMS Buttstock Extender 1 AR-15 Aluminum Matte

    and last and certainly least...

    3) Hack up an AR-15 PRS to work on your AR-10.

    Good luck to you (and again...get the RIGHT PART the first time and avoid the dremel route)!!

    Thanks ORD. I hear you and agree. Just looking for ways to cut a few bucks from my build. I love the PRS on my AR15 and on my Savage 10BA-LE.

    Started adding up parts for my build last night and I am into it for about $1739 already without a stock (including some parts that I still have to buy). This might not be much for some guys but I am buying this a piece at a time when I have some extra dollars. Just ordered the 24" Lilja barrel that I have been saving for (most expensive part). Still need the lower (doing an 80% Tactical Machining lower and it was a 8-9 month lead time when I ordered - with about 3 more months to go ). Local place has "build parties" where you bring in your lower and put it in the jigs on their CNC machine then press start. They charge like $65 for this. Cost comes out about the same as buying a finished DPMS lower without all the Kalifornia FFL hassle/charges. Just have to use a "bullet button" with 10 round mags while shooting it here and can never sell it. BTW Joebob outfitters has the .308 PRS for $209 with free shipping over $99 and also a 5% discount for Military/vets/LEO. Just out of black color right now. They are GTG too.

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    +1 on Slash's buffer and spring

    I use a slash XH buffer and slash custon AR10 spring with a Magpul UBR stock

    16" carbine

    works fantastic

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    If you get the PRS make sure it is the one for the AR-10. There is more room for the longer charging handle.

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    Quote Originally Posted by krw View Post
    Yes mine has a factory collapsible stk. I was wanting to switch it out to the CTR stock. Guess I can use it the way it is. Thank You for the info! krw
    If I was you, I would try the Battleline industries SAPR attachment on your CTR. Then you have the best of both worlds; collapsible stock, lighter, adjustable cheek weld, heel height, (as well as other adjustments). I have one on my setup, and like it.

    P.S. Rainier Arms has them
    Last edited by bullseye13; 08-15-2013 at 07:10 AM. Reason: Rainier has them

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    i would take ORD's advice. His always spot on. He has helped me out with his advice more times than I can count.

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    I like the Magpul UBR it is a very nice stock it allows u to keep ur eyes on target while moving into comfortable shoulder range.

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    ORD
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    Quote Originally Posted by Rjl0110 View Post
    I like the Magpul UBR it is a very nice stock it allows u to keep ur eyes on target while moving into comfortable shoulder range.
    Nothing at all wrong with the UBR (aside from perhaps the weight which is HIGH for a "collapsible" type stock, but still lighter than the PRS by around 5-10oz depending on the buffer you run). As with all other collapsible stocks on the AR-10/LR-308 platform rifles when running an AR-15 collapsible stock/receiver extension (including the shortened "Entry" extension the UBR is built around), just be sure to get a proper AR-10 "short" buffer to go with it as the AR-15 and Armalite-type AR-10 CAR buffers are too long to work with the longer carrier of the AR-10/LR-308.

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    I used the JP silent captured spring. Just cut off the Delryn spacer to the appropriate length and run it.

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    Magpul makes a kit to convert a prs from 15 specs to 10. I have an extra kit in fde. Pm me if interested

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    Quote Originally Posted by 19Scout77 View Post
    Magpul makes a kit to convert a prs from 15 specs to 10. I have an extra kit in fde. Pm me if interested
    Thanks, but I just picked up a new AR10/LR308 PRS from Deltaoutdoorsman.com for an awsome low price. Shipped the same day I ordered it and showed up in just a couple of days. Great communication and customer service! They are GTG!

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    ORD
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    Quote Originally Posted by 19Scout77 View Post
    Magpul makes a kit to convert a prs from 15 specs to 10. I have an extra kit in fde. Pm me if interested
    I'll have to store that tidbit away for future reference. Never heard that before now, but its nice to know. Out of curiosity, what is the cost from Magpul and what all is included in the kit (I'm assuming its just the shortened riser, but I don't know)?

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    Quote Originally Posted by ORD View Post
    I'll have to store that tidbit away for future reference. Never heard that before now, but its nice to know. Out of curiosity, what is the cost from Magpul and what all is included in the kit (I'm assuming its just the shortened riser, but I don't know)?
    Come with both a shortened riser and a longer piece of the stock that the riser nests against when retracted. IIRC it cost around $30.

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    I have both stocks on mine and prefer the PRS