Luth-AR MBA-3 Carbine Buttstock Black, 223 Mil-Spec Buffer Assembly

The Luth-AR MBA-3 Carbine Buttstock with .223 Mil-Spec Buffer Assembly is a complete AR-15 stock solution that ships ready to install. This modular design works with both commercial and mil-spec diameter carbine buffer tubes, making it a versatile upgrade for builders working with different AR platforms. The MBA-3 comes fully assembled with everything you need: the stock itself, a mil-spec buffer tube, carbine recoil buffer, recoil spring, receiver end plate, and castle nut. Just install it on your lower receiver and you're done.

Build quality matters when you're setting up a rifle you trust. The MBA-3 is constructed from glass-filled nylon—lightweight but tough enough for hard use. It's quick to swap in if you're upgrading an existing AR, and an anti-rattle screw keeps the fit secure and rattle-free once it's mounted. The black finish is clean and functional, no frills.

Adjustment is where this stock earns its place on a serious carbine. The 3-axis adjustable butt plate, adjustable cheek rest, and adjustable length of pull let you dial in a fit that works for your body and shooting style. Whether you're running an optic with a specific sight picture, wearing body armor, or just need a custom fit, you've got the tools to make it work. Multiple sling attachment points keep your mounting options open, and a Picatinny rail on the bottom lets you add a rear monopod for prone shooting or supported rest positions.

Compatible with .223 and most .308 AR carbine rifles, the MBA-3 fits the AR-15 and AR-10 platforms. It's the kind of straightforward, adjustable stock that doesn't try to be fancy but delivers the features that matter on the range or in the field.

Key Features

• 3-axis adjustable butt plate for custom fit and recoil management
• Adjustable cheek rest for optic eye relief and sight picture optimization
• Adjustable length of pull to match your shooting position and gear
• Compatible with both commercial and mil-spec buffer tubes
• Multiple sling mounting points for versatile carry options
• Bottom Picatinny rail for rear monopod or tactical accessories
• Glass-filled nylon construction—durable and lightweight
• Complete assembly kit includes buffer tube, buffer, spring, end plate, and castle nut—ready to install
• Anti-rattle screw for secure, quiet fit

Specifications

Frequently Asked Questions

What's included in the Luth-AR MBA-3 complete assembly kit?

The kit includes the MBA-3 stock itself, a mil-spec diameter buffer tube, carbine recoil buffer, carbine recoil spring, receiver end plate, castle nut, and an anti-rattle screw. Everything is included to install the stock directly onto your AR-15 lower receiver—no additional components required.

Will this stock work on my AR-15 or AR-10?

The MBA-3 is designed to fit AR-15 and AR-10 carbine platforms. It accommodates .223 rifles and most .308 AR carbines. The kit includes a mil-spec buffer tube, so it will work on receivers designed for mil-spec tubes. If your AR has a commercial-diameter buffer tube, the stock itself is still compatible, but you may need a different buffer tube than the one included in this kit.

How adjustable is the MBA-3 stock?

The MBA-3 offers three independent adjustments: a 3-axis adjustable butt plate, an adjustable cheek rest, and adjustable length of pull. These let you customize the fit for your body, your optics setup, and your shooting style.

Can I mount a sling or monopod to this stock?

Yes. The MBA-3 has multiple sling attachment points for various carry configurations, and a Picatinny rail on the bottom of the stock for mounting a rear monopod or other tactical accessories.