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Fully Adjustable Carbine Buttstock assembly to mount to a carbine rifle (6-positions mil-spec or commercial tube). This is our carbine stock – 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 Black MBA-3 comes with a medium soft rubber recoil pad Duro 85. – The FDE MBA-3 comes with a FDE hard butt plate as a pad. A Black medium soft rubber recoil pad is available for additional purchase. – The Luth-AR MBA-3 weighs roughly half that of comparable stocks coming in at just 18.5 ounces. – Fits all .223 and most .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 – 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