Luth-AR MBA-3 Carbine Buttstock Assembly - Black

Manufactured by Luth-AR
Manufactured by Luth-AR
7 Reviews

In Stock

Standard orders will ship out same day if ordered by 3:30pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



If you are still running a Mil-Spec M4 carbine stock on your AR-15 or AR-10, it is time to upgrade. The Luth-AR carbine buttstock is just the upgrade you need as it offers near unlimited adjustability. The cheek rest has one inch of height adjustments and the length of pull can add an additional 1-1/16 inch to be custom fit to your arm length. The rubber but pad can also be raised or lowered depending on your preference and shooting position. It is compatible with Mil-Spec or commercial 6-position carbine buffer tunes and is made from glass-filled nylon that retains strength while reducing weight. The MBA-3 carbine stock is also compatible with .223 or .308 caliber rifles if you get the correct buffer and recoil spring. Upgrade to this ergonomic buttstock today and you will understand why Luth-AR is the go-to brand when it comes to 3 gun competition rifles.

  • Made from glass-reinforced nylon
  • Durable textured adjustment knobs
  • Adjustable length of pull
  • Adjustable cheek rest height
  • Adjustable butt plate assembly (horizontal, vertical, and lateral)
  • Bottom picatinny rail for monopods
  • Flat bottom index screw that eliminates rattle
  • Requires SKU: GT-CUP for QD sling attachment point

The modular buttstock assembly is perfect for building a carbine length AR-10 battle rifle for fun at the range or hunting hogs out in the field. The buttstock includes a bottom mounted picatinny rail for attaching monopods for when you need to shoot prone or off the bench and want extra stability. It also features a socket that is compatible with the GT-CUP reversible quick detach sling swivel mount for long hunts out in the field or long days at the gun range. Additional recoil pads of different style and density can be purchased to further customize the feel of your rifle.

The Luth-AR company was founded by the same man who founded the DPMS and Panther Arms firearms companies. Randy Luth started as a machinist and built his way up to leading some of the most recognizable and respected companies in the firearms industry. The Luth-AR company now owns seven patents for high quality AR-15/.308 components and accessories that are built for the competition shooter, hunter, and gun enthusiast.
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MaterialNylon - Glass Filled
Sling MountQD Swivel Socket - Free Rotation
StorageNot Storage Capable
Weight13.8 Oz

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

7 reviews


Needs some improvement.

by -

All in all this is a good stock. The fit and finish is good and the many adjustments are great.
<br>But, the rear shoulder pads is horrible. After 200 rounds the pad started to hurt my shoulder. The pad is a series of slots with little tabs at each end that I'm guessing are designed to keep the stock in place on the shoulder when firing, and it does work for that purpose
<br>But for comfort? I give this a 1 star. I will be looking for a replacement for the but pad today.

Excellent stock

by -

This is an excellent stock at a great price. Lots of adjustability to ensure you are in the exact same spot on the rifle every time. I purchased it for my bolt action gun with a Knoxx Axion stock on it - UNFORTUNATELY it does not fit the Axiom stock - it is not mil-spec. I have it on my AR - so still happy.....

Very nice adjustable stock and keep your carbine buffer tube

by -

Put this on my 16" AR to replace the basic carbine stock. Works great. Adjustments are solid and get my cheek weld where I want it every time. Butt pad is not soft but its a .223 AR - what recoil? Its no harder than a standard carbine stock that has no rubber at the back. Would happily buy again.

Good build quality

by -

Received item today. Ordered on a Friday. Was well packed and arrived faster than planned. The item itself is good build quality and adjusts simply and effectively. Looking forward to taking it out on the range after the first of the year.

my "go to" stock for my builds


I used to use another highly regarded name brand.
<br>Switched to Luth and I now have their stocks on 7 of my builds.
<br>I put them on rifles I built for my son and my grand kids...this is now my go to stock on my builds.

Doesnt have listed QD feature.

by -

Part of why I bought this stock was the listed QD sling attackment post. Mine doesnt have that feature, which totally stinks. Fortunately, I had an extra end plate with a QD point, so I was able to complete my new 6.5 creedmoor build.

installing luth-ar-mba-3 on savage 10 ba stealth stock commercial tube


I just bought a luth-ar-mba-3 for my savage 10 ba stealth. it would not fit on my savage buffer tube. So i took a 6in. drill bit super glue double sided tape 120 grit sandpaper and a drill.Take and attach the sandpaper to the drill bit using the double sided tape the luth-ar-mba-3 has 6 ribs on the inside of the butt stock using the drill and bit sand the ribs down, check often so you do not over sand. takes approx. 10 mins.