Gear Review: Magpul UBR Stock

I made a mistake as a young man that I’ll share with you. As a college graduation present, I received an Armalite M15A4 from my parents. Like just about any idiot with his first AR, I couldn’t leave good enough (very good, actually) alone. I ripped the A2 style stock off in favor of some cheaply made M4 style collapsible unit. I’m not certain what my original rationale was but I know it wasn’t particularly well thought out.

The only thing that was nice about that collapsible stock was that I could adjust the length of pull for smaller shooters like my fiancée. I paid dearly for the privilege, though, by getting my facial hair ripped out every time I went to get a solid cheek weld. Not to mention the fact that it made my gun so front heavy as to become laughably impractical for all but benchrest shooting.

Enter the UBR Collapsible Stock. Besides looking unbelievably cool, its main claim to fame is the fixed cheekpiece. That’s right, you can have your adjustable stock and a consistent cheekweld too. No matter where your length of pull is set, you’ll have the same piece of smooth, beard-friendly plastic each and every time. And they say miracles can’t happen.


  • Weight, w/ Entry Receiver Extension: 1.63 lb.
  • Weight: 1.46 lb.
  • Length, Stock: 8.00-11.36 in.
  • LOP Adjustment: 7-Position (0.56 in. / position)
  • LOP Adjustment Range: 3.36 in.
  • LOP, Collapsed (M4/M16): 11.10 in.
  • LOP, Extended (M4/M16): 14.46 in.
  • Price: $265.00

Ratings (out of five stars):

Fit  * * * * *
I’ve had the pleasure of installing the M4 style buttstock before, so this was really straightforward. If you haven’t, never fear. The manual from Magpul is incredibly concise and easy to read. Everything went together with zero fuss, muss, or drama. All the pieces move in perfect harmony. There is no slack, wobble, or rattle. The whole piece is just incredibly well made. For this kind of coin, it damn well better be.

Function * * * * *

The UBR functions oh so very nicely. The length of pull adjustment is crisp with a nice audible snap. When you have it locked, it stays locked. I beat it against some rocks and the bed of my truck in the hope that I could break something, but I was met with no success. The UBR is hell bent for stout. The fixed cheekpiece is a godsend. I’ve never been so comfortable shooting my AR.

Accessory Integration  * * * * *

The UBR has reversible sling swivel attachment points and a nifty little storage area. As you can see, it can hold a good amount of chocolate gold coins. Batteries, a few extra bullets, or a spare firing pin could probably go in there too. For future reference, gold coins are preferable for your humble scribe. You can also add an aluminum strike plate in case you wanted to perform “various breaching operations as well as Close Quarters Battle butt-stroking maneuvers.”

Huskiness  * *
The only place where I can fault the UBR is in the weight category. Holy fat lady, this thing is heavy. Once installed, my AR went from a chunky 7.5 lbs. to an even chunkier 8.5 lbs. with just irons installed. Throw a scope and rings on it and we might be looking at a 10 lb. rifle. For benchrest shooting, that isn’t really a concern. But if you were looking to build a lightweight carbine, I’d look at another one of Magpul’s buttstocks.

The UBR just weighs too much. I might try to muscle it around a competition at some point just to say I’ve done it, but this modification pretty much cements this gun’s status as stationary scope tester.

Overall Rating  * * * * 1/2
For what I do with this AR (stationary shooting), this is the best of both worlds. I can have a consistent cheekweld and still adjust the length of pull for smaller shooters or for bulky winter clothing. There is no doubt that the UBR is well-built and will most likely outlast me. However, if I were building out a M4 style AR, this wouldn’t be my first choice. It’s just too heavy. Give Magpul some time and I bet they come up with a lighter version. This is design is just too cool to not get some R&D tweaking.