The Magpul ACS-L Carbine Stock in Stealth Gray (brand part no. MAG378-GRY) is a drop-in replacement buttstock for AR-15 and M4-pattern carbines built on mil-spec-diameter receiver extension tubes. Short for Adaptable Carbine Stock – Light, the ACS-L trims down Magpul’s original ACS by removing its battery storage tubes, shedding weight and bulk while keeping the same center storage compartment and enhanced cheek weld. It is a collapsible stock, so length of pull adjusts to the shooter and their gear. Note that the mil-spec receiver extension tube itself is sold separately.

Key Specifications

• Drop-in replacement buttstock for AR-15/M4 carbines built on mil-spec receiver extension tubes.
• Collapsible design lets shooters adjust length of pull for their build and gear setup.
• Retains the ACS’s center storage compartment for spare parts or small accessories.
• Keeps the same enhanced cheek weld as the original ACS for a more consistent sight picture.
• Removes the ACS’s battery storage tubes for a slimmer, lighter stock.
• Finished in Stealth Gray to match gray and two-tone rifle builds.

Frequently Asked Questions

Does this include the receiver extension tube? No, the mil-spec receiver extension (buffer tube) is sold separately; this is the stock body only.

How is the ACS-L different from the standard ACS? The ACS-L removes the battery storage tubes found on the original ACS, making it slimmer and lighter while keeping the same cheek weld and storage compartment.

Is this stock adjustable? Yes, it is a collapsible stock that adjusts along a mil-spec receiver extension for length of pull.

Buy the Magpul ACS-L Carbine Stock, Stealth Gray

Shooters who like the ACS platform but want to trim weight will find the ACS-L an easy swap onto any mil-spec buffer tube. Browse more AR braces and stocks from Magpul Industries and order it from our Lubbock, Texas gun shop for fast, insured shipping.