American Made Parts for American Rifle Builders


Luth-AR MBA-3 Carbine Stock

Retail: $159.95
( saved $4.90 )
2 reviews Write a Review
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Product Description

  • Fully Adjustable Carbine Buttstock assembly to mount to a carbine rifle (6-positions mil-spec or commercial tube) – This is our carbine stock
  • Additional 1″ height on cheek rest
  • 3-axis Adjustable Butt Plate Assembly extends additional 1 1/16″ length of pull and includes the following movement:
    • Horizontal for linear adjustment (i.e. length of pull)
    • Vertical for a perfect butt plate fit into the curvature of the shoulder.
    • Lateral adjustment for a ½ inch left or right cast
    • This butt plate assembly is interchangeable with the original MBA-1 Buttstock
  • Includes a Picatinny Rail on the bottom rear of the Stock Body to attach your choice of many accessories.
  • Designed a flat bottom index set screw (10-24) to eliminate that constant rattle of carbine collapsible buttstock. This also allows you to secure the stock in your favorite position.
  • Comes with hard butt plate as a pad.
  • The Luth-AR MBA-3 weighs roughly half that of comparable stocks coming in at just 18.5 ounces.
  • Fits all .223 and most .308 AR carbine style rifles
  • Super Strong Glass Filled Nylon
  • Easy to replace and quick to install
  • Uses 4 out of the 6 positions on a mil-spec or commercial tube


  • Ergonomic
  • Adapts To Existing Commercial and Mil-Spec Buffer Tubes
  • Certain after Market Commercial Buffer Tubes that exceed  1.172″ may not fit
  • The vertical struts for the MBA 3 are fixed therefore the cheek pc is not reversible like the MBA 1 however the cheek piece itself is designed with a cheek pad for the lefty
  • NOT interchangeable with A2 standard buffer tube. You will need to purchase a MBA-1 or MBA-2 to fit the A2 tubes

2 Reviews

  • 4
    Magpul PRS Alternative

    Posted by Trapman on Aug 26th 2020

    Was going to buy the PRS, but no one has them. So I thought I'd give the Luth a try. It's lighter than the PRS, which is good. Better than the PRS if you want a shorter LOP. It's adaptable every way. Should've come with a QD swivel cup. The softer butt pad is pricey. Should be OK. Just got it, so we'll see.

  • 5
    Great adjustable stock

    Posted by Chuck on Mar 30th 2019

    This is a an excellent piece , it is well molded, all edges are nicely finished so you have no sharp spots to deal with. The adjustable length and height allows it to fit almost any shooters fitment needs quick and repeatably, just use and ink pen to make tick marks for each shooter. The addition of a screw to take up slack between it and the buffer tube is a great feature, it allows a firm solid fit with hampering adjustment. The one little nuance that you should be aware of is with the locking pin, it has a small cut out that allows it to ride down over a protruding stop on the front portion of the stock to allow for mounting and dismounting. If the pin is not rotated after assembly to prevent that, you will pull the stock off the tube every time you try to extend it.