Luth-AR MBA-3 AR-15 Stock w/ Buffer Assembly .223/5.56 Buffer - MBA-3K-M
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Luth-AR
Overview
The Luth-AR MBA-3 AR-15 Stock is an adjustable polymer stock designed to enhance your shooting experience with a customizable length of pull for improved comfort and accuracy. It comes equipped with a buffer assembly suitable for .223 and 5.56 calibers, making it a practical choice for a variety of builds. This stock is frequently found in builds utilizing a rifle gas system, particularly in configurations chambered for 5.56 NATO.
Specifications
Available Merchants(6)
Prices checked
Price Alert
Build history on GunPartPicker
Builders have added the Luth-AR MBA-3 AR-15 Stock w/ Buffer Assembly .223/5.56 Buffer - MBA-3K-M to their builds on GunPartPicker. Since April 2026, it ranks #93 of the 560 stocks and braces builders have added. Builds with this stock are split between 5.56 NATO (42%) and 6.5 Grendel (17%), mostly on rifle-length gas (63%, then carbine-length 13%), and mostly AR-15 (69%, then AR-10 23%).
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 5 of the 6 retailers we track have it in stock. Prices barely moved in October 2026, holding around $178.99, with no real sale all month. Buying today, the lowest price is $174.79 at Optics Planet, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Read the guide: AR-15 Stock Popularity Report →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the builds that include this one
Wilson Combat AR-15 Lower Receiver Forged
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Breek Arms AR-15 Warhammer MOD2 Ambidextrous Charging Handle Black
Bravo Company M16 Bolt Carrier Group Black
PSA 20" Rifle-Length 6.5 Grendel 1/8 Stainless Steel 15" Lightweight M-LOK Upper - With BCG & CH - 5165448709
Hogue AR-15 OverMolded Pistol Grip - Beaver Tail - No Finger Grooves - Black
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the Luth-AR MBA-3 AR-15 Stock w/ Buffer Assembly .223/5.56 Buffer - MBA-3K-M
| Build | Parts | Total |
|---|---|---|
 | 15 | $1045.62 |
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