Description
Building out a rifle-length AR and tired of chasing down parts one at a time? The Luth-AR MBA-1 with .223/5.56 Buffer Assembly hands you the whole package. This is a complete kit built to assemble a full A2 rifle buffer system on your .223/5.56 lower, so instead of ordering a stock here and a buffer there, you get it all in one box and start turning wrenches. Everything ships in a clean Flat Dark Earth finish that pairs nicely with tan or multicam builds.
What Makes the MBA-1 Worth Bolting On
The heart of this kit is the MBA-1 modular buttstock itself, made from glass filled nylon that stays tough without piling on weight. The whole assembly tips the scales at right around 1.26 pounds, roughly half of what a lot of competing adjustable stocks weigh. You get an adjustable cheek rise that lifts up to an extra inch for a solid cheek weld behind raised optics, plus a length of pull that extends about 1 1/16 inches using the extended buttplate. The cheek piece doesn't just move up and down either, it slides fore and aft, and it's fully ambidextrous so lefties and righties both get dialed in.
Setting Up Your MBA-1 Buffer System
This kit ships complete with the A2 buttstock extension tube, a standard buffer, and a .223/5.56 buffer spring, so the buffer math is already handled for you. It mounts to a standard A2 rifle-length buffer tube and works with .223 and 5.56 AR-15 builds. Keep in mind this is a fixed rifle-length setup and won't fit collapsible carbine tubes with the six-position telescoping design.
Molded QD cup pockets sit on both sides to accept Grovtec self-tapping cups, and there's a bag hook underneath for steadying up off a bench or bag. That combination of adjustability, low weight, and a proper cheek weld is why the MBA-1 has become a go-to on precision, varmint, and DMR-style builds.
Key Specifications
- Manufacturer: Luth-AR
- Manufacturer Part Number: MBA-1FK
- UPC: 859992007326
- Color: Flat Dark Earth
- Style: Fixed Rifle Length, Adjustable
- Caliber: .223 Rem / 5.56 NATO
- Buffer Tube Type: A2 Rifle Length
- Material: Glass Filled Nylon
- Weight: 1.26 lbs
- Cheek Rise Adjustment: Up to 1 inch
- Length of Pull Adjustment: Up to 1 1/16 inch
- Fitment: Fits AR-15 and AR-10 rifle-length A2 tubes
- Compatibility: Not compatible with carbine 6-position telescoping tubes
What’s Included
- MBA-1 modular buttstock (Flat Dark Earth)
- A2 buttstock extension tube (rifle length)
- Standard buffer
- .223/5.56 buffer spring
Frequently Asked Questions
Does the MBA-1 kit come with everything I need to set up the buffer system?
Yes. This kit is a complete package for assembling an A2 rifle buffer system on a .223/5.56 lower. It ships with the MBA-1 buttstock, the A2 extension tube, a standard buffer, and a .223/5.56 buffer spring, so you're not tracking down parts separately.
Will the MBA-1 fit a collapsible carbine buffer tube?
No. The MBA-1 is a fixed rifle-length stock built for a standard A2 rifle buffer tube. It is not compatible with the six-position telescoping carbine tubes, so if that's what you're running you'd want to look at a Luth-AR MBA-3 or MBA-4 instead.
Can lefties use the MBA-1 comfortably?
Absolutely. The MBA-1 is fully ambidextrous and shoulders comfortably from either side. The cheek piece comes pre-installed for right-handed use but moves over to the other side for left-handed shooting, and it adjusts both up and down and fore and aft.
How much does the MBA-1 assembly weigh?
The MBA weighs in at roughly 1.26 pounds, which is about half the weight of many comparable adjustable stocks. That glass filled nylon build keeps things light without giving up durability, which is a big reason it lands on so many precision and DMR builds.




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