Luth-AR
Luth-AR is best known for the MBA line of adjustable buttstocks — length of pull, comb height, and butt-pad position all adjust without tools, on a stock built from glass-filled nylon that weighs half what comparable stocks do. Beyond stocks, Luth-AR supplies retro-style A1 and A2 furniture kits, complete upper and lower receivers, and the small parts — buffer tubes, springs, charging handles, gas tubes — that AR-15 and AR-10 builders need to finish a rifle from the ground up.
Read our full Luth-AR Buying Guide ↓
What Is Luth-AR Known For?
Luth-AR built its reputation on the MBA (Modular Buttstock Assembly) line of adjustable AR stocks, along with a full catalog of retro-build parts for shooters recreating classic A1 and A2-configuration rifles. Between the two, Luth-AR covers both ends of the AR-15 market: modern precision-fit ergonomics and old-school retro accuracy.
The MBA Stock Line: MBA-1, MBA-2 and MBA-3
The MBA-3 is Luth-AR's flagship adjustable buttstock — a 3-axis butt-plate with length-of-pull, height, and lateral adjustment plus an adjustable cheek riser, all in an 18-ounce glass-filled nylon shell that's roughly half the weight of comparable stocks. It fits both mil-spec and commercial 6-position buffer tubes and works across .223/5.56 and most .308 AR platforms. The MBA-1 and MBA-2 are earlier, simpler versions of the same concept for buyers who don't need the full 3-axis adjustment.
Luth-AR Retro Builds: A1 and A2 Furniture and Receivers
For shooters building a retro-configuration rifle, Luth-AR sells complete A1 and A2 upper and lower receivers along with furniture kits like the FK-A1RG that bundle handguards, pistol grips, and stocks in period-correct finishes. These parts are machined to the same mil-spec dimensions as original retro rifles, so they drop into a standard AR-15 lower without any fitting work.
Luth-AR Small Parts and Lower Parts Kits
Luth-AR's small-parts catalog covers the parts that wear out or get upgraded most often on an AR-15: buffer springs, buffer tubes, castle nuts, extractors, forward assists, charging handles, gas tubes, and barrel extensions. The Lower Receiver Parts Kit bundles the full set of small parts needed to complete a stripped lower receiver in one order.
Building a Complete Upper with Luth-AR Parts
Luth-AR also sells upper receivers and the components to build one from scratch — barrel extensions, front sight bases, charging handles, and gas tubes in carbine length. Combined with a stripped upper and barrel, these parts let a builder assemble a complete AR-15 upper without buying a pre-built unit.
Frequently Asked Questions
What is the Luth-AR MBA-3?
Luth-AR's flagship adjustable buttstock, with 3-axis butt-plate adjustment, adjustable cheek riser, and length-of-pull adjustment, built from lightweight glass-filled nylon.
Does the MBA-3 fit both AR-15 and AR-10 rifles?
Yes — it fits standard 6-position mil-spec and commercial buffer tubes used on both .223/5.56 AR-15s and most .308 AR-10 platforms.
What are Luth-AR's retro parts used for?
Building period-correct A1 and A2-configuration AR-15s — Luth-AR sells the receivers, furniture, and small parts to build a retro rifle from a stripped lower.
Can I build a complete AR-15 from Luth-AR parts alone?
Yes. Between upper and lower receivers, buttstocks, small parts kits, and barrel components, Luth-AR sells enough parts to build a complete rifle.
Browse our full AR-15 Upper Receiver Parts and AR-15 Lower Receiver Parts selection for components from other brands.