The self-contained carbine stock — the ACS locks down like a fixed stock and carries like a supply cache.
The Magpul ACS Carbine Stock (MAG370) — Adaptable Carbine/Storage — pairs a friction-lock system that clamps the stock rigid against the receiver extension with dual water-resistant storage compartments in the cheek housing. The result is a collapsible stock with fixed-stock stability that also keeps batteries, spare parts and small mission essentials sealed inside the rifle itself.
The wide, contoured cheek weld surface supports precise work behind optics, the rubber buttpad plants in the shoulder, and sling integration covers loops and QD alike. For duty rifles and go-bag carbines that must be self-sufficient, the ACS remains the most complete stock Magpul builds at this weight.
Why shooters choose the ACS
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Friction-lock system — wobble-free, fixed-stock stability
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Dual storage compartments — water-resistant onboard supply
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Wide contoured cheek weld — excellent behind magnified glass
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Comprehensive sling options — loops and QD-ready
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Three finishes — Black, Flat Dark Earth, Olive Drab Green
Fit & installation
Fits Mil-Spec carbine receiver extensions. Slide on, set length of pull, engage the friction lock — then load the compartments and forget them until needed.
Specifications
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Model: MAG370
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Platform: AR15/M4
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Fit: Mil-Spec carbine receiver extension
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Storage: Dual storage compartments
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Finishes: Black, Flat Dark Earth, Olive Drab Green
Stability, storage, sorted. Order the ACS today — in stock at Xtreme Tactical Gun Parts with free UK delivery.
Explore more: Rifle & Shotgun Stocks, Precision Rifle Stocks, AR-15 Parts or browse all Magpul.
