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Questions & Answers
what is your buffer weight for the 308 version? Expert Answer

The Luth-AR MBA-3 Carbine Buttstock .308 model has a 3.8oz buffer.

by Hunter, Gear Expert, May 27, 2022
Is the color of the FDE actually darker than in the picture displayed? It looks more like dessert sand to me. Expert Answer

The color does appear to be slightly darker on LUTH-AR's website. You can see a photo of the color at https://www.luth-ar.com/wp-content/uploads/2016/05/MBA-3-FDE.jpg.

by Tiffany S., Gear Expert, June 28, 2019
Customer Reviews
Helpful Positive Review
Luth AR MBA-3 by DP, Verified Owner, December 19, 2025
Stock is quality, sturdy with good adjustment ergonomics. Only downside is the cheek riser can get in the way of an AR pattern charging handle. Overall a good stock.
1/1 found this helpful
Helpful Positive Review
Savage 10BA Stealth by ChikinNWafols, Verified Owner, August 2, 2018
I put this in my Savage 10BA Stealth using the stock buffer tube. The fit is very tight and it’s very hard to manipulate the stock adjustment. I’m thinking it would probably be best to get a new buffer tube. The product itself is very sturdy looki...
Read More...
13/14 found this helpful
Helpful Positive Review
it works…… by tj, Verified Owner, August 5, 2025
I’m a fan of the adjustability with the exception of the control for adjusting the length along the buffer. That knob is a bit tucked away and could be better
1/1 found this helpful
Helpful Positive Review
Are you tired of being forced to hold your head in an uncomfortable position when looking down range through your optic? Well you just found the solution! The MBA-3 gives me so much flexibility and comfort and drastically reduces the time it takes to...
Read More...
1/1 found this helpful
Helpful Positive Review
demo luth-ar mba-3 buttstock by Ernest, September 11, 2022
came quickly and was of high quality just like new but I did not have to put it together and was less expensive. put this on my Ar-15 6.5 grendal for 500 yard work. It gave me better hold and less felt recoil.
1/2 found this helpful
Helpful Positive Review
Luth AR mba stock by Richard, Verified Owner, May 8, 2025
This is my 4th Luth AR stock. Optics Planet is a great company. I bought 2 scopes a few weeks ago and received 130 bonus bucks so I used them to buy this stock which came to $12 dollars.
1/1 found this helpful
Read All 89 Reviews
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Product Info for Luth-AR MBA-3 Carbine Buttstock

Install this Luth-AR 308 Mil-Spec Buffer Stock on your existing firearm's commercial or Mil-Spec buffer tube to experience the difference a more adjustable, lighter and stronger stock can make. Luth-AR designed each of these AR15 Stocks with a Picatinny rail on the bottom rear for the attachment of your favorite accessories that will enhance your precision and overall shooting experience. The extra-strength glass-filled nylon construction of the Luth-AR MBA-3 Carbine Stock Assembly makes it one of the lightest on the market while still offering uncompromising durability for any use. Length-of-pull, height and cheek rise are all adjustable to make your firearm finally feel like it's truly yours. Plus, there's even sling attachment points so that you can comfortably carry your firearm however you'd like. Unlike other buttstocks, this assembly won't make that annoying rattling noise thanks to the included flat bottom index screw. Advance your rifle build with the ergonomic and cost-effective Luth-AR MBA-3 Modular Buttstock Assembly.image

Specifications for Luth-AR MBA-3 Carbine Buttstock:

Manufacturer: Luth-AR
Gun Type: Carbine
Weight: 18.5 oz
Length: 8.75 in
Condition: New
Gun Make: AR Platform
Fabric/Material: 6061-T6 Aluminum

Features of Luth-AR MBA-3 Carbine Buttstock

  • Ergonomic Design
  • Adapts To Existing Commercial and Mil-Spec Buffer Tubes
  • Certain after Market Commercial Buffer Tubes that exceed 1.172? diameter, may not fit
  • The MBA-3 and MBA-4 are available in Black or Flat Dark Earth
  • The vertical struts for the MBA-3 are fixed, therefore the cheek piece is not reversible like the MBA-1 however the cheek piece itself is designed with a cheek pad for left-handed use
  • Caution: the MBA-3 and MBA-4 Carbine buttstocks are not designed to be used with Large Bore Calibers such as .338 Lapua or .50 BMG applications. See our MBA-1 and MBA-2 Rifle buttstocks as alternatives.
  • The MBA-3 Carbine buttstock is NOT interchangeable with A2 standard buffer tube. You will need to purchase a MBA-1 or MBA-2 Rifle buttstock to fit A2 tubes

Package Contents:

  • Luth-AR MBA-3 Carbine Buttstock

Luth-AR MBA-3 Carbine Buttstock Orderable Models

List of Orderable Models

  • Luth-AR MBA-3 Stock Assembly, FDE, MBA-3F , MPN: MBA-3F , UPC: 859819007003 , Code: 3FN-BSC-MBA3S-MBA-3F
  • Luth-AR MBA-3 Stock Assembly, Black, MBA-3 , MPN: MBA-3 , UPC: 862388000122 , Code: 3FN-BSC-MBA3S-MBA-3
  • Luth-AR MBA-3 Stock Assy. with Mil-Spec .223 Kit, Black, MBA-3K-M , MPN: MBA-3K-M , UPC: 859992007418 , Code: 3FN-BSC-MBA3S-MBA-3K-M
  • Luth-AR MBA-3 Stock Assy. with Mil-Spec .308 Kit, Black, MBA-3K308-M , MPN: MBA-3K308-M , UPC: 859992007395 , Code: 3FN-BSC-MBA3S-MBA-3K308-M
  • Luth-AR MBA-3 Stock Assy. with Mil-Spec .223 Kit, FDE, MBA-3FK-M , MPN: MBA-3FK-M , UPC: 859992007456 , Code: 3FN-BSC-MBA3S-MBA-3FK-M
  • Luth-AR MBA-3 Stock Assy. with Commerical .223 Kit, Black, MBA-3K-C , MPN: MBA-3K-C , UPC: 859992007401 , Code: 3FN-BSC-MBA3S-MBA-3K-C
  • Luth-AR MBA-3 Stock Assy. with Commerical .308 Kit, Black, MBA-3K308-C , MPN: MBA-3K308-C , UPC: 859992007388 , Code: 3FN-BSC-MBA3S-MBA-3K308-C
  • Luth-AR MBA-3 Stock Assy. with Commerical .308 Kit, FDE, MBA-3FK308-C , MPN: MBA-3FK308-C , UPC: 859992007425 , Code: 3FN-BSC-MBA3S-MBA-3FK308-C
  • Luth-AR MBA-3 Stock Assy. with Mil-Spec .308 Kit, FDE, MBA-3FK308-M , MPN: MBA-3FK308-M , UPC: 859992007432 , Code: 3FN-BSC-MBA3S-MBA-3FK308-M

Luth-AR MBA-3 Carbine Buttstock Unavailable & Discontinued Models

List of Unorderable Models

  • Open Box, Dealer Demo, Luth-AR MBA-3 Stock Assembly, Flat Dark Earth, MBA-3F , MPN: MBA-3F-DMO , Code: 3FN-BSC-MBA3S-MBA-3F-DMO
  • Open Box, Dealer Demo, Luth-AR MBA-3 Stock Assembly, Black, MBA-3 , MPN: MBA-3-DMO , Code: 3FN-BSC-MBA3S-MBA-3-DMO
  • DEMO, Luth-AR MBA-3 Stock Assembly, Black, MBA-3 , MPN: MBA-3-DEMO , Code: 3FN-BSC-MBA3S-MBA-3-DEMO
  • Open Box, Dealer Demo, Luth-AR MBA-3 Stock Assy. with Mil-Spec .223 Kit, Black, MBA-3K-M , MPN: MBA-3K-M-DMO , Code: 3FN-BSC-MBA3S-MBA-3K-M-DMO
  • Luth-AR MBA-3 Stock Assy. with Commerical .223 Kit, FDE, MBA-3FK-C , MPN: MBA-3FK-C , UPC: 859992007449 , Code: 3FN-BSC-MBA3S-MBA-3FK-C
  • Open Box, Dealer Demo, Luth-AR MBA-3 Stock Assy. with Mil-Spec .308 Kit, Black, MBA-3K308-M , MPN: MBA-3K308-M-DMO , Code: 3FN-BSC-MBA3S-MBA-3K308-M-DMO
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