Luth-AR MBA-3 Modular Stock Kit AR-15/AR-10 Black .223
Luth-AR
$197.35
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Luth-AR
Luth-AR MBA-3 Modular Stock Kit AR-15/AR-10 Black .223
The Luth-AR MBA-3 Modular Stock Kit delivers competition-grade adjustability for AR-15 and AR-10 platforms, giving shooters precise control over fit, comfort, and consistency straight out of the box.
- Compatible with both Commercial and Mil-Spec diameter carbine buffer tubes
- 3-axis adjustable butt plate fine-tunes cant, height, and offset independently
- Adjustable cheek rest raises or lowers for optimal sight alignment and comfort
- Length of pull adjustment accommodates a wide range of shooter builds and gear
- Bottom Picatinny rail accepts a rear monopod for bench or precision shooting support
- Multiple sling attachment points offer flexible carry and shooting positions
Who This Is For
The MBA-3 is an ideal upgrade for competitive shooters, precision rifle enthusiasts, and AR owners who demand a fully customizable stock without sacrificing durability. Whether you're running a lightweight .223 build or a hard-hitting .308 AR-10, this kit gives you the ergonomic control needed to shoot tighter groups and maintain comfort over long sessions. The glass-filled nylon construction keeps weight down while standing up to hard use, and the included complete installation kit means you won't need to source additional hardware.
Specifications
| Brand | Luth-AR |
|---|---|
| Model | MBA-3 Modular Stock Kit |
| Color | Black |
| Compatible Platforms | AR-15, AR-10 |
| Buffer Tube Compatibility | Commercial & Mil-Spec Diameter |
| Caliber Compatibility | .223 / 5.56; Most .308 AR Carbines |
| Length of Pull | Adjustable |
| Cheek Rest | Adjustable Height |
| Butt Plate | 3-Axis Adjustable |
| Accessory Rail | Bottom Picatinny (Monopod Compatible) |
| Sling Mounts | Multiple Points |
| Material | Glass-Filled Nylon |
| Kit Includes | Complete Installation Hardware |
| Anti-Rattle Screw | Included |
Frequently Asked Questions
Will the MBA-3 fit my existing buffer tube without buying additional parts?
Yes — the MBA-3 is designed to work with both Commercial and Mil-Spec diameter carbine buffer tubes, so it will fit the vast majority of AR-15 and AR-10 lower receivers right out of the box. An anti-rattle screw is included to ensure a secure, wobble-free fit on either tube diameter. The complete kit also includes all necessary installation hardware, so no additional purchases are required.
Can I use the MBA-3 on a .308 AR-10 build, or is it only for .223?
The MBA-3 is fully compatible with .223/5.56 AR-15 rifles and most .308 AR-10 carbine-style rifles. Because AR-10 buffer tube dimensions can vary slightly between manufacturers, it's worth confirming your lower receiver uses a standard carbine-length buffer tube before ordering. For the majority of popular AR-10 platforms, the MBA-3 will install without any modification.
How do I adjust the cheek rest and butt plate on the MBA-3?
The MBA-3 features tool-accessible adjustment points for the cheek rest (vertical height), the 3-axis butt plate (cant, height, and lateral offset), and the overall length of pull. Each adjustment is designed to be straightforward and repeatable, allowing you to dial in your fit for different optics heights, shooting positions, or body armor setups. Once set, the adjustments lock firmly in place to maintain your zero between shooting sessions.
