The Luth-AR MBA-3 Modular Stock Kit (brand part number MBA-3K308-M) is a fully adjustable carbine stock built to fit .223 and most .308 AR carbine-style rifles, including the AR-10 platform. Luth-AR engineers the MBA-3 to work with both commercial and mil-spec diameter carbine buffer tubes, so it drops onto a wide range of existing AR-15 and AR-10 lowers. The stock includes a 3-axis adjustable butt plate, an adjustable cheek rest, and adjustable length of pull, along with multiple sling mounting points and a bottom Picatinny rail for a rear monopod. Molded from strong glass-filled nylon, it installs easily thanks to an included anti-rattle screw, and this Complete Assembly Kit adds everything needed to finish a .308/7.62 AR-10 lower: a mil-spec diameter carbine buffer tube, .308 carbine recoil buffer, carbine recoil buffer spring, receiver end plate, and castle nut.

Key Specifications

• Fits both .223 and most .308 AR carbine-style rifles, including AR-10 platform builds.
• Compatible with both commercial and mil-spec diameter carbine buffer tubes.
• Features a 3-axis adjustable butt plate for a customized shoulder fit.
• Includes an adjustable cheek rest for proper cheek weld with optics of varying height.
• Offers adjustable length of pull to fit different body types and shooting positions.
• Built with multiple sling mounting points and a bottom Picatinny rail for a rear monopod.
• Molded from strong glass-filled nylon for durability with easy installation.
• The Complete Assembly Kit includes a mil-spec carbine buffer tube, .308 carbine recoil buffer, recoil spring, receiver end plate, and castle nut to finish a .308 AR-10 lower.

Frequently Asked Questions

What comes in this kit? The MBA-3 stock, a mil-spec diameter carbine buffer tube, .308 carbine recoil buffer, carbine recoil spring, receiver end plate, and castle nut.

Does it fit AR-15 lowers too? Yes, the MBA-3 fits .223 AR-15 carbines as well as most .308 AR-10 carbine-style rifles.

Is the stock adjustable for fit? Yes, it offers adjustable length of pull, a 3-axis butt plate, and an adjustable cheek rest.

Buy the Luth-AR MBA-3 Modular Stock Kit

Order the Luth-AR MBA-3 stock kit for your .308 AR-10 build from our Lubbock, Texas gun shop for fast, insured shipping. See more Luth-AR AR-10 stocks, forends, and forearms for your rifle.