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Luth-Ar
The Luth-AR MBA-4F Skullaton Stock Assembly in Flat Dark Earth is a lightweight, purpose-built replacement buttstock for AR carbine rifles. Weighing just 9.5 ounces, this skullaton-design stock pairs durability with minimal added weight—ideal if you're running a .223 or .308 AR carbine and want a modern alternative to heavier fixed or standard adjustable stocks. The glass-filled nylon construction delivers the strength you need for field use without compromise, and the minimalist profile gives your carbine a distinctly contemporary look while keeping ergonomics front and center.
Installation is straightforward: the MBA-4F mounts to standard mil-spec or commercial buffer tubes and uses 4 of the 6 available positions, so you won't need any special adapters for most common setups. The included Picatinny rail opens the door to accessories, and Luth-AR's anti-rattle set screw design keeps things solid in the field without the noise. If you need a higher cheek rest or longer pull for your shooting style, the stock accepts Luth-AR's optional cheek piece and extended butt plate assemblies—meaning you can fine-tune fit without buying an entirely new stock.
One thing to know upfront: this carbine stock is engineered for .223 and .308 applications. It's not rated for large-bore calibers like .338 Lapua or .50 BMG, and it won't work with A2 buffer tubes—if you're running that setup, Luth-AR's MBA-1 or MBA-2 rifle stocks are the right choice. Some aftermarket commercial tubes over 1.1172 inches in diameter may not fit either, so measure before you order if you've upgraded your buffer tube.
| Product | MBA-4F Skullaton Stock Assembly |
| Manufacturer | Luth-Ar LLC |
| Color | Flat Dark Earth (FDE) |
| Weight | 9.5 ounces |
| Material | Glass-filled nylon |
| Tube Compatibility | Mil-spec and commercial buffer tubes (not A2 tubes) |
| Position Range | Uses 4 of 6 available positions on compatible tubes |
| Rail System | Integrated Picatinny rail |
| Caliber Compatibility | .223 and .308 AR carbine rifles |
The MBA-4F is designed for .223 and .308 AR carbines with mil-spec or commercial buffer tubes. It will not fit A2 buffer tubes—you'd need an MBA-1 or MBA-2 rifle stock for that setup. If your buffer tube diameter exceeds 1.1172 inches, check compatibility before purchasing. The stock is not suitable for large-bore calibers like .338 Lapua or .50 BMG.
The MBA-4F itself occupies 4 of the 6 positions on a mil-spec or commercial tube, so you have some adjustability by sliding it along the tube. For additional length of pull, you can add Luth-AR's optional butt plate assembly or 3-axis butt plate assembly, which add approximately 1 1/16 inches. Similarly, the optional cheek piece adds roughly 1 inch of cheek height.
The MBA-4F weighs just 9.5 ounces, making it a lightweight option for carbine builds where you want to minimize unnecessary weight without sacrificing strength.
The MBA-4F stock assembly comes ready to mount directly to your existing mil-spec or commercial buffer tube. Installation is quick and straightforward—no special tools or gunsmithing required. Simply slide it onto your tube and secure it with the included anti-rattle set screw.
Luth-Ar
The Luth-AR MBA-4F Skullaton Stock Assembly in Flat Dark Earth is a lightweight, purpose-built replacement buttstock for AR carbine rifles. Weighing just 9.5 ounces, this skullaton-design stock pairs durability with minimal added weight—ideal if you're running a .223 or .308 AR carbine and want a modern alternative to heavier fixed or standard adjustable stocks. The glass-filled nylon construction delivers the strength you need for field use without compromise, and the minimalist profile gives your carbine a distinctly contemporary look while keeping ergonomics front and center.
Installation is straightforward: the MBA-4F mounts to standard mil-spec or commercial buffer tubes and uses 4 of the 6 available positions, so you won't need any special adapters for most common setups. The included Picatinny rail opens the door to accessories, and Luth-AR's anti-rattle set screw design keeps things solid in the field without the noise. If you need a higher cheek rest or longer pull for your shooting style, the stock accepts Luth-AR's optional cheek piece and extended butt plate assemblies—meaning you can fine-tune fit without buying an entirely new stock.
One thing to know upfront: this carbine stock is engineered for .223 and .308 applications. It's not rated for large-bore calibers like .338 Lapua or .50 BMG, and it won't work with A2 buffer tubes—if you're running that setup, Luth-AR's MBA-1 or MBA-2 rifle stocks are the right choice. Some aftermarket commercial tubes over 1.1172 inches in diameter may not fit either, so measure before you order if you've upgraded your buffer tube.
| Product | MBA-4F Skullaton Stock Assembly |
| Manufacturer | Luth-Ar LLC |
| Color | Flat Dark Earth (FDE) |
| Weight | 9.5 ounces |
| Material | Glass-filled nylon |
| Tube Compatibility | Mil-spec and commercial buffer tubes (not A2 tubes) |
| Position Range | Uses 4 of 6 available positions on compatible tubes |
| Rail System | Integrated Picatinny rail |
| Caliber Compatibility | .223 and .308 AR carbine rifles |
The MBA-4F is designed for .223 and .308 AR carbines with mil-spec or commercial buffer tubes. It will not fit A2 buffer tubes—you'd need an MBA-1 or MBA-2 rifle stock for that setup. If your buffer tube diameter exceeds 1.1172 inches, check compatibility before purchasing. The stock is not suitable for large-bore calibers like .338 Lapua or .50 BMG.
The MBA-4F itself occupies 4 of the 6 positions on a mil-spec or commercial tube, so you have some adjustability by sliding it along the tube. For additional length of pull, you can add Luth-AR's optional butt plate assembly or 3-axis butt plate assembly, which add approximately 1 1/16 inches. Similarly, the optional cheek piece adds roughly 1 inch of cheek height.
The MBA-4F weighs just 9.5 ounces, making it a lightweight option for carbine builds where you want to minimize unnecessary weight without sacrificing strength.
The MBA-4F stock assembly comes ready to mount directly to your existing mil-spec or commercial buffer tube. Installation is quick and straightforward—no special tools or gunsmithing required. Simply slide it onto your tube and secure it with the included anti-rattle set screw.
