Luth-AR MBA-1 Rifle Buttstock Black, 223 / 5.56 Buffer Assembly

The Luth-AR MBA-1 rifle buttstock with .223/5.56 buffer assembly is a complete, ready-to-install system for AR-15 builders and shooters who want a fully adjustable platform without the premium price tag. This isn't a stripped buttstock—it comes packaged with everything needed to assemble a functional A2-style buffer system on your rifle-length lower: the MBA-1 buttstock itself, A2 buffer tube extension, standard buffer, and caliber-matched spring. If you're piecing together an AR or upgrading an existing rifle, this kit eliminates the need to source components separately.

What sets the MBA-1 apart is its modular design and user-configurable fit. The buttstock features both adjustable length-of-pull (ranging from 10.5 inches collapsed to 11.5 inches extended, with an additional 1 1/16 inch of adjustment) and adjustable cheek rise, so you can dial in comfort and repeatability whether you're prone on the bench, shooting off bags, or running it tactically. The cheek piece arrives installed for right-handed shooters but can be moved to either side, making this genuinely ambidextrous for both lefties and righties who switch shoulders. At 18.4 ounces for the buttstock and 5.1 ounces for the buffer, weight is kept reasonable—important if you're building a dedicated hunting rifle or competition gun where every ounce matters.

The MBA-1 also includes multiple sling attachment options: molded pockets that accept Grovtec QD cups (sold separately) and compatibility with a rail attachment (available separately), so you can configure your carry system to suit your mission. The modular design means you're not locked into a specific look or setup—swap the buttstock later if your needs change, and the buffer assembly works with standard A1 or A2-length tubes on any AR-15 rifle configuration.

Key Features

• Complete buffer system kit—includes buttstock, A2 extension tube, standard buffer, and matched spring; nothing else to buy to get running
• Adjustable length-of-pull (10.5–11.5 inches) plus additional 1 1/16 inch micro-adjustment for a custom fit
• Adjustable cheek rise for consistent sight picture and recoil management
• Fully ambidextrous—cheek piece is movable for left or right shoulder use
• Modular design allows future upgrades without replacing the entire system
• Integrated sling attachment points with QD cup pockets and rail attachment compatibility
• Lightweight at 18.4 oz buttstock, 5.1 oz buffer

Specifications

Frequently Asked Questions

What AR platforms is the MBA-1 compatible with?

The MBA-1 is designed for AR-15 rifles using a rifle-length (full-size) buffer tube. It is not compatible with carbine-length rifles or those with telescoping assemblies. The buttstock itself can interchange with standard A1 or A2 buttstocks, or any aftermarket buttstock with an overall length of approximately 10.5 inches.

Is the MBA-1 truly ambidextrous?

Yes. The cheek rise piece arrives pre-installed for right-handed shooters but can be repositioned to either side of the buttstock, making it comfortable and functional for both left and right-hand shooters. You can also switch shoulders and use it either way once configured.

Does this kit include everything I need to install it?

Yes. The MBA-1 comes complete with the buttstock, A2 buffer tube extension, standard buffer, and matched .223/5.56 buffer spring. You will need basic AR tools and familiarity with lower receiver assembly, but no additional buffer system components are required.

Can I adjust the length-of-pull on the MBA-1?

Yes. The buttstock offers adjustable length-of-pull ranging from 10.5 inches collapsed to 11.5 inches extended, plus an additional 1 1/16 inch of fine adjustment, allowing you to customize fit for different shooters, gear configurations, or shooting positions.