Magpul STR – Carbine Stock Mil-Spec Model (Od Green)

Product Description

The Magpul STR Carbine Stock Mil-Spec Model in OD Green is a drop-in replacement stock for AR-15 carbines built on mil-spec receiver extension tubes. It mounts to mil-spec sized carbine buffer tubes from Colt, Armalite, S&W, LMT, and similar manufacturers.

This stock solves two persistent problems: carbine wobble and gear storage. The supplemental friction lock tightens tolerances between stock and tube, reducing movement that degrades accuracy on follow-up shots. Two water-resistant battery storage tubes sit on the left and right sides, accessible from the rear in any position of adjustment via hand-removable rubber plugs.

The sloping cheek weld offers a wide contact surface, and the replaceable 0.30″ rubber butt pad adds slip resistance. The shielded release latch design prevents snagging on gear or accidental activation during manipulation.

Key Facts

• Compatibility: Mil-spec sized carbine receiver extension tubes from Colt, Armalite, S&W, LMT, and others
• Battery Storage: Two water-resistant tubes, each stores up to two batteries, accessible from rear via rubber plug
• Friction Lock: Supplemental lock minimizes stock wobble for improved accuracy
• Sling Mounts: Reversible QD swivel mount (fits up to 1.5″ push-button swivels) and 1.25″ sling loops
• Finish: OD Green
• Lock Spring: Premium chrome-silicon lock spring for positive locking and long service life

Magpul STR vs Standard Carbine Stocks

Standard mil-spec carbine stocks slide onto the buffer tube and lock at discrete positions, but dimensional tolerances between manufacturers often create side-to-side play. That wobble shifts your cheek weld and point of aim between shots.

The STR stock addresses this with a friction lock screw that tightens against the buffer tube. Turn the lock and the stock seats firmly, eliminating rattle without binding the adjustment mechanism. The lock spring is chrome-silicon for durability under repeated torque cycles.

The dual battery tubes are sealed with rubber plugs and positioned to avoid interference with charging handle operation or cheek placement. You can access them without removing the stock or adjusting its position.

Mil-Spec Buffer Tube Fit and Compatibility

This stock is designed for mil-spec diameter carbine receiver extension tubes, which measure 1.14″ outside diameter at the tube body. Commercial-spec tubes are slightly larger and will not fit this stock.

The stock is compatible with receiver-mount sling attachment systems like the Magpul ASAP. The reversible QD socket on the rear accepts push-button sling swivels up to 1.5″ wide. The bottom rear also features 1.25″ sling loops for traditional two-point slings.

If you are upgrading lower parts or building a new carbine, confirm your buffer tube diameter before ordering. Call 817-393-4000 if you need help identifying your receiver extension type.

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, builds, and repairs on site in Roanoke. Call 817-393-4000 for answers on fit, compatibility, or to place an order.

Frequently Asked Questions

Q: Does the Magpul STR stock fit commercial buffer tubes?

A: No, the STR stock mounts only on mil-spec sized carbine receiver extension tubes. Commercial-spec tubes have a larger diameter and are not compatible. Measure your buffer tube or call 817-393-4000 for help identifying your tube type before ordering.

Q: What does the friction lock on the STR buttstock do?

A: The friction lock is a screw mechanism that tightens the stock against the buffer tube to eliminate side-to-side wobble. It reduces movement between the stock and tube without affecting length-of-pull adjustment. Tightening the lock improves consistency in cheek weld and sight alignment.

Q: Will a QD sling swivel fit the Magpul STR stock?

A: Yes, the STR stock has a reversible QD swivel socket on the rear that accepts push-button sling swivels up to 1.5″ wide. The swivel is not included. The stock also has 1.25″ sling loops on the bottom rear for traditional slings.

Q: How many batteries fit in the STR stock storage tubes?

A: Each of the two storage tubes holds up to two batteries. The tubes are water-resistant and accessible from the rear of the stock in any adjustment position. Remove the rubber plug by hand to access the tubes.

Q: Can I use the Magpul STR stock with a receiver-mount sling adapter?

A: Yes, the STR stock is compatible with the Magpul ASAP and other receiver-mount sling attachment systems. The stock design does not interfere with rear sling plates or endplate-mount adapters.

Q: Is the Magpul STR stock better than the CTR or MOE stock?

A: The STR stock offers dual battery storage tubes and a friction lock that the MOE stock does not have. The CTR stock has a friction lock but only a single smaller storage compartment. If you need maximum battery capacity and the tightest lock-up, the STR is the choice. Browse our full selection of grips, pads, and stocks or call 817-393-4000 to discuss which stock suits your rifle and mission.

Additional information