View Full Version : Butt Stocks for .308 Questions

03-02-2010, 2:52 PM
I managed to find some information on this regarding the Magpul UBR stock, but I'm not certain if it applies to all stocks.

I'm building my DPMS .308 and I'd like to purchase a stock that isn't the Magpul PRS. The only other stocks I see specifically listed for .308 are all carbine length. So my question is two-fold.

1. Is there a rifle length alternative to the Magpul PRS?
2. Can any stock be used if I make sure to use the .308 buffer tube, buffer and spring?

I read the UBR can be used with a .308 buffer tube, but I couldn't find any information beyond that.

03-02-2010, 3:15 PM
The UBR comes with it's own tube for installation and no other tube will work with the stock. What makes the URB work witht he .308 platform is getting the correct buffer and buffer spring (carbine). If you like a fixed stock but do not want the PRS stock the traditional a1/a2 buttstocks will work as long as you have .308 rifle length buffer and buffer spring. When I get my camera working again i'll post some pictures to help clairfy the differences.

03-02-2010, 3:24 PM
Ah, that makes sense.

The one frustrating thing about the .308 platform, I'm finding, is that there just isn't as much variety compared to the AR-15.

03-02-2010, 3:34 PM
check out midwayusa.com they have some good stuff for the .308 and there is a lot of market support for the .308 ar's. Most stocks can be used, they accept ar-15 triggers, the bullet button is the same as well as the pistol grip if you want to go featureless. There are several big name companies that support the ar-10 and dpms lr 308 platforms it's just a matter of what fits in your price range, if you want an ar-10/dpms lr 308 you gotta pay to play :(. A complete bolt carrier group will be hard to find under 360, and if you want to swap out uppers this will not be cheap either but you still have that option. If you are on a tight budget just make sure you get it right the first time, and BRD in .308 will probably make you homelss.

03-02-2010, 3:44 PM
Ah, that makes sense.

The one frustrating thing about the .308 platform, I'm finding, is that there just isn't as much variety compared to the AR-15.

Barrels, BCGs, receivers, and handguards/forearms/rails are really the only thing that is limited. Most everything from the AR15 platform will fit the AR308 platform. For stocks you just need a different buffer and spring. Even many pieces from the fire control group (FCG) work.

03-02-2010, 3:46 PM
Nah, not a tight budget. Complete BCGs with bolt are running about $250 on the high end. The prices definitely seem to have gone down from a year ago, with complete upper assemblies as low as $600.

I'm just looking to stand out a bit. Looking at all the ARs on the picture posts, I notice certain similarities. Namely, the darn PRS stock.

03-02-2010, 3:51 PM
I just picked up my .308 lower today. I am going with an A2 stock with a monopod on the buttstock, something like this:


03-02-2010, 3:57 PM
Interesting, I'm not sure if I'd want it, but it is different.

03-02-2010, 4:00 PM
you can use any stock as long as you get the proper buffer

03-02-2010, 4:04 PM
So, buffer tube is the same? I just need the carbine length buffer and spring?

03-02-2010, 4:05 PM
tubes are the same the only difference is spring and buffer

03-02-2010, 4:06 PM
also one last thing PRS are different between AR15 and 308 varients is because the cheek rest is small to allow the travel of the charging handle

03-02-2010, 4:19 PM
So if I wanted to use, let's say, this stock: http://www.midwayusa.com/viewProduct/?productNumber=794931

I can as long as I buy these?

03-02-2010, 4:22 PM
you correct on the spring and buffer for a carbine stock however if im correct the mako stock is rifle length

03-02-2010, 4:23 PM
Wait, I'm confused.

I thought that if I wanted to use a standard AR-15 stock with a .308 receiver I needed to switch out to the carbine buffer and spring.

03-02-2010, 4:31 PM
but theres 2 different type of AR15 buffer tubes there is your carbine length tube and than the Rifle length buffer tubes

03-02-2010, 4:33 PM
Rifle length buffer tube


03-02-2010, 4:51 PM
Sorry, you must all think I'm slow.

So, really, there's nothing I need to worry about? I just get the correct length buffer tube, spring and buffer and I'm good to go for most stocks?

Does it matter that I'm going with a DPMS pattern lower?

Just so I'm clear, I'm not interested in the UBR. Something like the Mako I linked earlier is really what I'm going for.

03-02-2010, 4:58 PM
yup heres mines

03-02-2010, 5:17 PM
I'm getting one of these.



03-02-2010, 6:05 PM
I bought a .308 A2 assembly from brownells for my AR-10 build.

Calif Mini
03-02-2010, 8:11 PM
For what its worth:

Armalite shows 2 different buffers for the rifle and carbine. Same weight but different lengths. But they show only one AR-10 spring.

The AR-15 rifle and the AR-10 rifle extension tubes are listed as exactly the same number.

Not sure one can use all this info as gospel as I have found mistakes on their parts list info.

Hope this helps a little.


03-03-2010, 1:07 AM
I have both ar-15's and one ar-10 pattern rifle and THE TUBES ARE THE SAME :), what you put in the tube is what makes it a .308 stock. The mako stock you link my have issues with the charging handle clearing when pulled all the way to the rear since the BCG is much longer. If you go with a side cocking upper you can use what ever stock you want. I have a PRS on my .450bm and it's great, I have a URB on my ar-10 pattern and really enjoy it as well. I suggest making a choice about your stock after you decide what upper you want.