Magpul MAG310-ODG CTR Carbine Stock OD Green for AR-15, M16, M4 (Mil-Spec Tube Not Included)

The Magpul CTR Carbine Stock in OD Green is a mil-spec drop-in replacement buttstock built for AR-15, M16, and M4 carbines that run mil-spec sized receiver extension tubes. Whether you're setting up a duty rifle, a precision carbine, or a versatile home-defense platform, the CTR delivers a slimmed-down profile that won't snag on gear or clothing while keeping your setup light and fast. The shielded release latch and friction lock system mean your stock stays put under recoil, and the adjustable length of pull (LOP) accommodates different shooters and loadouts without fumbling.

Built to Magpul's usual standard, this OD Green finish pairs rugged durability with a professional appearance. The cheek weld geometry works whether you're running iron sights, red dots, or magnified optics, and the stock is compatible with Magpul CTR cheek risers if you need additional height for precision shooting. The removable rubber butt-pad grips your shoulder reliably even over body armor or heavy gear, while ambidextrous QD sling mounts and 1.25-inch sling loops on the rear and bottom give you flexibility in how you rig it. A lanyard hole lets you thread paracord for backup retention or carry options.

One critical note: this is the mil-spec version, which fits the smaller 1.14-inch OD buffer tubes found on Colt-manufactured M4s and other mil-spec carbines. Make sure your receiver extension matches before ordering—commercial-spec tubes require a different stock. The CTR is made in the USA and is TACOM-approved for military M4/M4A1 service rifles.

Key Features

• Mil-spec sized design drops into standard Colt, Armalite, S&W, LMT, and compatible receiver extension tubes
• Shielded release latch prevents snags and accidental collapse
• Supplemental friction lock minimizes stock wobble and improves accuracy
• Adjustable length of pull: 10.5 inches (collapsed) to 13.8 inches (extended)
• Removable 0.3-inch rubber butt-pad for secure shoulder fit and impact protection
• Ambidextrous push-button QD sling mount (handles up to 1.5-inch swivels)
• Rear and bottom sling loops (1.25 inches)
• Lanyard hole for custom paracord retention
• Compatible with Magpul CTR cheek risers and ASAP/ASAP QD mounts
• Premium chrome-silicon lock spring for durability
• Made in the USA; TACOM-approved for military service rifles

Specifications

Frequently Asked Questions

What receiver extension tube does the Magpul CTR mil-spec stock fit?

The CTR mil-spec version fits smaller 1.14-inch OD buffer tubes, typically found on Colt-manufactured M4s and mil-spec carbines from Armalite, S&W, LMT, and similar manufacturers. If your rifle has a commercial-spec (larger diameter) tube, you'll need the commercial-spec CTR instead. Check your tube diameter before ordering to avoid compatibility issues.

Does this stock come with a receiver extension tube?

No, the receiver extension tube is not included. You must have a compatible mil-spec sized buffer tube already installed on your rifle or sourced separately.

Can I adjust the length of pull on the CTR?

Yes. The CTR offers 3.3 inches of adjustment range, collapsing to approximately 10.5 inches LOP and extending to 13.8 inches LOP on a standard M4-length receiver extension. This flexibility lets you fit different shooter body types and accommodate gear worn during shooting.

Is the CTR compatible with optic mounts and cheek risers?

The CTR is compatible with Magpul CTR cheek risers, which give you additional height for proper cheek weld when running magnified optics or when the stock is in the fully extended position. It also works with Magpul ASAP and ASAP QD receiver-mount sling systems.