The Luth-AR Modular Buttstock Assembly (MBA) for AR style carbines is designed to replace the standard buttstock on your AR. The MBA-4 is designed to work with a 6-position Mil-Spec or Commercial buffer tube. The MBA-4 is a direct replacement a standard adjustable carbine buttstock without additional Length-of-Pull or Cheek rise in a low-cost, lightweight, strong and high-quality design.

The MBA-4 requires a Carbine buffer tube, either Mil-Spec or Commercial. Please review the information provided in the Requirements tab. This stock works with both carbine Commercial and Mil-Spec tubes/assemblies.

The MBA-4 also features an anti-rattle set screw. The modular design of the MBA Buttstock allows you to configure your buttstock to your specific and personal needs. The MBA features multiple attachment points for a sling, including molded pockets that will accept Grovtec QD cups, sold separately.

Description

• Light weight stock to mount to a carbine rifle  (6-positions mil-spec or commercial tube) – This is our carbine skeleton stock
• The MBA-4 requires a Carbine buffer tube, either Mil-Spec or Commercial. Please review the information provided in the Requirements tab. This stock works with both carbine Commercial and Mil-Spec tubes/assemblies.
• Fits all .223 and .308 AR carbine style rifles
• Super Strong Glass Filled Nylon
• 21st century look
• Ergonomic
• Easy to replace and quick to install
• Uses 4 out of the 6 positions on a mil-spec or commercial tube

Features:

• Flat Dark Earth
• Lightweight buttstock for the carbine AR, weighing in at 9.5 ounces
• Easy to add our Cheek Piece: Cheek piece will add an additional 1″ height on cheek rest
• Easy to add our Butt Plate Assembly or 3-Axis Butt Plate Assembly: The assemblies will add an additional 1 1/16″ length of pull with extended length buttplate
• Adapts To Existing Commercial and Mil-Spec Buffer Tubes
• Certain after Market Commercial Buffer Tubes that exceed 1.1172″ diameter may not fit
• Caution: the MBA-3 and MBA-4 Carbine buttstocks are not designed to be used with Large Bore Calibers such as .338 Lapua or .50 BMG applications. See our MBA-1 and MBA-2 Rifle buttstocks as alternatives
• The MBA-4 Carbine buttstock is NOT interchangeable with A2 standard buffer tube. You will need to purchase a MBA-1 or MBA-2 Rifle buttstock to fit A2 tubes 
• Picatinny Rail
• Revolutionary Anti-Rattle Set Screw

Compatible Buffer Assemblies:

• .223 Mil-Spec Carbine Buffer Assembly
• .223 Commercial Carbine Buffer Assembly
• .308 Mil-Spec Carbine Buffer Assembly
• .308 Commercial Carbine Buffer Assembly

Additional Information:

When used with the smaller diameter Mil-Spec tube you can adjust the set screw located on the left hand side using the included 3/32” Allen wrench. Turn clockwise to slowly tighten the set screw until it contacts the buffer tube. The Anti-rattle set screw is NOT designed to lock the position of the stock. Over tightening may damage the butt stock.

When sliding the buttstock onto a 6-position buffer tube, the lock pin has a notch in the head of the lock pin that must line up with a tab on the stock body. Once the slot and tab are lined up, the pin can be fully retracted allowing the buttstock to slide onto the tube. The MBA-3 should slide easily without resistance. If there is any resistance, the lock pin is not fully retracted. 

The MBA-4 does not include the following accessories, they can be purchased on our website separately in the Accessories section:

• Sling Swivels (Side or Rear) Sold Separately, see below. Also see Tech-Tip Videos
• Carbine Buffer tube
• Carbine Buffer Body
• Carbine Spring
• Latch Plate
• Lock Ring