The Magpul ACS-L (Adaptable Carbine Stock – Light) in FDE (brand part no. MAG378-FDE) is a drop-in replacement buttstock for AR-15/M4 carbines using mil-spec-sized receiver extension tubes. It’s a streamlined version of Magpul’s original ACS stock, keeping the same center storage compartment and cheek weld shooters know from the ACS line while removing the battery tubes for a slimmer, lighter overall package.

Key Specifications

• Fits mil-spec diameter receiver extension tubes.
• Includes the same center storage compartment as the original ACS.
• Keeps the same cheek weld as the ACS line.
• Slimmer and lighter than the original ACS, with the battery tubes removed.
• Finished in FDE.
• Molded from impact-resistant polymer.
• Integrated QD sling swivel attachment point.
• 3.25-inch length-of-pull adjustment range across multiple positions.
• Friction-lock mechanism holds the selected position.

Frequently Asked Questions

How is the ACS-L different from the original ACS? It removes the battery storage tubes for a slimmer, lighter stock while keeping the same center storage compartment and cheek weld.

What receiver extension tube does this fit? Mil-spec diameter tubes.

Buy the Magpul ACS-L Carbine Stock, Mil-Spec, FDE

Order this Magpul Industries stock from our AR braces and stocks selection. Contact our Lubbock, Texas gun shop with any fitment questions before it’s ready to ship.