WeaponsGradeCode

It all starts with a $10 stock wrench from Amazon:

Cheap AR15 Wrench

…note it includes the carbine castle nut wrench (far left) and rifle tube wrench (middle.) We’ll need both.

Get your ghetto vice and stick a short 2×4 in it. Trim the 2×4 so the AR-10 mag-well fits in it.

Ghetto AR-10 Lower Vice Adapter

Now, with the spousal unit holding the un-mounted ghetto vice, turn the castle nut and remove the carbine buffer tube:

Remove the AR-10 Carbine Buffer Tube

Now install the Magpul UBR buffer tube:

Install the Magpul UBR Tube

Now install the UBR top stock with the cheek piece. Simply slide it on and install the screw at the back of the cheek piece that goes into the receiver extension:

Install UBR top stock with cheek piece.

Install the bottom stock:

Install the bottom stock and you are done.

Here’s a closeup of the AR-10 carbine vs UBR receiver extensions:

Carbine vs UBR receiver extensions

Here’s the rifle with the UBR installed:

AR-10 10A4C with Magpul UBR

The result is a vastly improved cheek weld and handling of the rifle. The collapsible stock left a wobbly feeling when aiming. The UBR gives the feel of a solid wooden stock without losing the extensible stock feature.

It’ll likely be standard equipment on any AR rifle I buy/build.

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This stuff runs great in my AR-10.

…I think the “for M1A use” warning is to keep the .308 guys from buying it. You can shoot .308 in a 7.62×51mm rifle, but not the other way around and this is 7.62×51mm ammo.

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After shooting about 150 rounds with the stock collapsible stock found on the Armalite AR-10 and almost all AR-15 carbines I decided they weren’t worth my time or money. They rattle around like cheap toys and your check weld while aiming is right at the stock/buffer tube interface. I quickly discovered the UBR is the answer to both problems: rock solid and an un-interrupted cheek weld surface.

Here’s the box, packaging, contents, and poster:

Magpul UBR Box

Magpul UBR Open Box

Magpul UBR Contents

Magpul UBR Poster 2

Magpul UBR Poster 2

The stock:

Magpul UBR

Magpul UBR Left

Magpul UBR Right

…and its construction:

Magpul UBR Bottom

Magpul UBR End

Magpul UBR Stock Bottom

Magpul UBR Stock Top

Magpul UBR Tube Front

Magpul UBR Tube Back

So in summary, the UBR includes the stock and buffer tube for an AR-10 or AR-15. You only need to include the buffer and spring. It’s a rock solid stock that provides a consistent cheek weld and fixed stock stability. I plan to use it on additional AR platform builds.

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So to install a Magpul UBR on an AR-10 carbine you must convert your buffer/spring system to something loosely AR-15 compatible as that’s what the UBR’s designed for. So I ordered Slash’s CAR-10 XH Buffer and spring from http://www.heavybuffers.com. The communication was smooth and the shipping very prompt. When received, the packaging could have used some additional inspiration, but the buffer is a hunk of steel and tungsten so it’s all good. Here the plastic bag was inside the USPS envelop which had broken open, I didn’t rip it apart. The envelope was then inside the box which was undamaged in shipping:

CAR-10 XH Buffer Shipping Condition

The product was undamaged. Here’s some shots of the head stamp and spring:

CAR-10 XH Buffer head stamp

CAR-10 XH Buffer and spring

…also note that the spring appears to be an AR-10 spring that was crudely cut. I suspect it’ll work but I think I’ll turn back the sharp point at the end to avoid damaging the UBR tube. I probably would not buy the spring again.

More on its performance later.

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