Magpul STR – Carbine Stock (FDE)

Product Description

The Magpul STR Carbine Stock in FDE is a mil-spec sized adjustable stock engineered with dual battery storage compartments and a supplemental friction lock system. It mounts on mil-spec carbine receiver extension tubes from Colt, Armalite, S&W, LMT, and other manufacturers.

This stock addresses two common AR platform concerns: receiver wobble and field storage. The friction lock reduces play between stock and buffer tube, while water-resistant storage tubes on both sides provide accessible battery capacity.

The sloping cheek weld offers a wide contact surface, and the replaceable 0.30″ rubber butt-pad provides an anti-slip surface with increased impact protection. A shielded release latch prevents snagging and accidental operation during movement.

Key Facts

• Compatibility: Mil-spec sized carbine receiver extension tubes from Colt, Armalite, S&W, LMT, and others
• Storage: Two water-resistant battery tubes, one on each side, accessible from the rear via hand-removable rubber plugs
• Lock System: Supplemental friction lock minimizes wobble; premium chrome-silicon lock spring provides positive locking
• Sling Mounting: Reversible QD swivel mount fits up to 1.5″ push-button swivels; 1.25″ sling loops at rear/bottom
• Finish: FDE (Flat Dark Earth)
• SKU: MAG470-FDE

How the STR Stock Reduces Receiver Wobble

Most carbine stocks rely solely on the locking pin to secure position. The Magpul STR adds a supplemental friction lock that creates lateral tension against the buffer tube. This reduces side-to-side movement that can affect consistency during rapid transitions or precision work.

The chrome-silicon lock spring maintains tension across thousands of adjustment cycles. The friction lock works independently of the main locking mechanism, so you retain full six-position adjustability without sacrificing stability.

Battery Storage Design and Access

Each side of the STR houses a water-resistant storage tube accessible from the rear. The tubes remain accessible in any stock position because the plugs are hand-removable rubber—no tools required. This design lets you stage batteries for optics, lights, or electronics without adding external pouches.

The storage compartments are sealed against moisture but not pressure-rated for submersion. They function as field-expedient dry storage rather than waterproof capsules.

Sling Attachment Options on the STR

The STR provides two sling mounting methods. A reversible QD swivel socket accepts push-button sling swivels up to 1.5″ wide, and you can install the socket on either the left or right side depending on your carry preference. At the rear bottom, molded 1.25″ sling loops accommodate traditional two-point sling hardware.

The stock is also compatible with receiver-mount attachments like the Magpul ASAP, giving you additional front mounting points for single-point or hybrid sling configurations. You can browse our full selection of grips, pads, and stocks for complementary lower parts to complete your build.

Buying from Western Sport in Roanoke, TX

Western Sport is a licensed FFL/SOT dealer and gunsmith shop serving North Texas and the DFW area since 2007. Owner and gunsmith Lance Rankin and his team handle transfers, custom builds, and expert guidance on parts selection. Call 817-393-4000 with compatibility questions or to place an order.

Frequently Asked Questions

Does the Magpul STR stock fit commercial buffer tubes?

No, the STR mounts only on mil-spec sized carbine receiver extension tubes. Commercial tubes have a larger diameter and different locking groove spacing, so the STR will not fit or lock properly. Verify your buffer tube diameter before ordering.

What is the friction lock on the STR stock and how do you adjust it?

The friction lock is a tensioning screw inside the stock that applies lateral pressure against the buffer tube to reduce wobble. You adjust it using a flat-head screwdriver through an access point on the stock body. Tighten until wobble disappears but the stock still slides smoothly between positions.

Can I use a QD sling swivel with the Magpul STR?

Yes, the STR has a reversible QD swivel socket that accepts push-button sling swivels up to 1.5″ wide. You can configure the socket for left- or right-side mounting depending on your carry preference.

How does the STR compare to the Magpul MOE stock?

The STR adds dual battery storage tubes, a supplemental friction lock system, and a larger cheek weld surface compared to the MOE. The MOE is lighter and simpler with no storage or friction adjustment. Choose the STR if you need battery capacity and maximum stability; choose the MOE for a lightweight, streamlined option.

Is the butt-pad on the STR stock replaceable?

Yes, the 0.30″ rubber butt-pad is replaceable. It provides an anti-slip surface and added impact protection, and you can remove it if it wears or if you want to install an aftermarket pad.

Will the Magpul STR work with receiver-mounted sling attachments?

Yes, the STR is compatible with receiver-mount sling attachments such as the Magpul ASAP and similar systems. The stock design allows clearance for these mounts, giving you additional sling attachment points forward of the stock itself.

Additional information