WeaponsGradeCode

Here’s the new M4gery. I hope Santa Claus will bring the MOE grip and UBR.

So I really wanted and Armalite lower but they’ve decided that constant back orders is preferable t0 cash in the bank so I went with a pre-built Stag lower from West Coast Armory. I also picked up a Magpul MOE handguard, receiver extension, spring, and magazine from Midway USA. Below are some pictures of the product.

Here are some pictures of the ammo I bought:

Black Hills .308

Nosler Custom .308

Black Hill Gold .308

Federal Premium .308 150 GR Nosler Ballistic Tip

Black Hills, Federal Premium, and Nosler Custom rounds together

Below are images comparing the uppers of an AR-10 and AR-15.

To justify getting an AR rifle, it needed to be legal to hunt with in Washington which requires at least a .240 caliber rifle. That led me right to the AR-10. Of course, as I researched and built that rifle I came to the conclusion that I really needed and AR-15 too. Honestly, who doesn’t.
I wanted something small and light which meant a 14.5″ barrel with a permanently mounted flash hider. Talking to the local dealer it became clear that was a hassle. Enter BCM.
At just the right time their lightweight 14.5 uppers became available and I bought it as fast as I could… They typically don’t last long. I also included the BCM BCG as it too is a quality piece of hardware.
I bought it on Saturday and it was in the mail on Monday and at the house on Friday.
The quality is amazing and the freebies, including the hat are great. Below are some pictures.

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.

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 7.62x51mm rifle, but not the other way around and this is 7.62x51mm ammo.

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.