The Luth-AR Modular Buttstock Assembly (MBA) for AR style carbines is designed to replace the standard buttstock on your AR. The MBA-3 is designed to work with a 6-position Mil-Spec or Commercial buffer tube. The MBA-3 features a 3-Axis Buttplate with Length-of-Pull adjustment as well as height and lateral adjustments, and an adjustable cheek rise in a low-cost, lightweight, strong and high-quality design.

The MBA-3 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-3 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. Includes a rail attachment for attaching a monopod. The MBA features multiple attachment points for a sling, including molded pockets that will accept Grovtec QD cups, sold separately.

Description

• Fully Adjustable Carbine Buttstock assembly to mount to a carbine rifle (6-positions mil-spec or commercial tube) – This is our carbine stock
• The MBA-3 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.
• Additional 1″ height on cheek rest
• 3-axis Adjustable Butt Plate Assembly extends additional 1 1/16″ length of pull and includes the following movement:
• Horizontal for linear adjustment (i.e. length of pull)
• Vertical for a perfect butt plate fit into the curvature of the shoulder.
• Lateral adjustment for a ½ inch left or right cast
• This butt plate assembly is interchangeable with the original MBA-1 Buttstock
• Includes a Picatinny Rail on the bottom rear of the Stock Body to attach your choice of many accessories.
• Designed a flat bottom index set screw (10-24) to eliminate that constant rattle of carbine collapsible buttstock. This also allows you to secure the stock in your favorite position.
• The MBA-3 comes with a  medium soft rubber recoil pad, Duro 85.
• The Luth-AR MBA-3 weighs roughly half that of comparable stocks coming in at just 18.5 ounces.
• Fits all .223 and .308 AR carbine style rifles
• Super Strong Glass Filled Nylon
• Easy to replace and quick to install
• Uses 4 out of the 6 positions on a mil-spec or commercial tube
• If you require a butt stock that will utilize the first 2 holes of the buffer tube to fully collapse, you can remove the cheek rest from the MBA-3, or order an MBA-4, order an MBA-4 and a 3-axis buttplate or order an MBA-5 buttstock.

Features

• Ergonomic
• Adapts To Existing Commercial and Mil-Spec Buffer Tubes
• Certain after Market Commercial Buffer Tubes that exceed  1.172″ diameter, may not fit
• The MBA-3 and MBA-4 are available in Black or Flat Dark Earth
• The vertical struts for the MBA-3 are fixed, therefore the cheek piece is not reversible like the MBA-1 however the cheek piece itself is designed with a cheek pad for left-handed use
• 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-3 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 

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

The MBA-3 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 Buffer Spring
• Latch Plate
• Lock Ring

Installation Notes:  

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.