The Magpul CTR is a mil-spec collapsible carbine stock for AR-15 and M4 rifles, fitting any Mil-Spec-diameter receiver extension.
The Magpul CTR (Compact/Type Restricted, MAG310) is built around one mechanical idea executed perfectly: a supplemental friction lock that clamps the stock body hard against the receiver extension, eliminating the rattle and play that plague standard collapsible stocks. The result is a rock-solid cheek weld that behaves like a fixed stock, from a unit that still adjusts instantly across the buffer tube's positions.
The A-frame profile sheds weight and snags, the rubber buttpad locks into the shoulder, and sling integration is comprehensive — including a standard QD socket point. It is the stock you see on service rifles and serious training carbines for a simple reason: it removes variables, and consistent shooting is built on removed variables.
How It Compares
Compare with the Magpul STR Carbine Stock Mil-Spec for AR-15/M4 and Magpul MOE SL Carbine Stock Mil-Spec for AR-15/M4.
Key Features
- Supplemental friction lock: zero wobble, fixed-stock stability
- Repeatable cheek weld: the same sight picture every mount
- Slim A-frame profile: light, snag-free, fast handling
- Rubber buttpad: plants in the shoulder pocket, protects the stock
- Four finishes: Black, Flat Dark Earth, Olive Drab Green, Modified Coyote Brown
Compatibility & Fitment
Fits AR-15/M4 rifles running a Mil-Spec-diameter carbine receiver extension (buffer tube), which is the common standard on most current builds. Commercial-diameter tubes are slightly larger and will not take this version, so check your buffer tube specification before you buy. Fitting is the usual stock swap — depress the lever, seat the stock, then engage the friction lock and feel the difference immediately.
What's Included
- Magpul CTR carbine stock
- Built-in friction-lock lever
- Receiver extension (buffer tube) not included
Technical Specifications
Platform | AR-15 / M4 |
Fits | Mil-Spec carbine receiver extension |
Material | Reinforced polymer |
Finish | Black, Flat Dark Earth, Olive Drab Green, Modified Coyote Brown |
Adjustment | Supplemental friction lock |
US Shipping & Support
Shipped from D&R Sports Center in the USA with fast, tracked delivery. Questions on fit, mounting or which model suits your setup? Our team is glad to help before and after your purchase.
Frequently Asked Questions
Will the CTR fit my carbine?
It fits AR-15/M4 rifles running a Mil-Spec-diameter carbine receiver extension, which is the common standard on most builds. Commercial-diameter tubes are slightly larger and won't take this version, so measure or check the specification of your buffer tube before you buy. If you're unsure which you have, contact us with details of the rifle before you buy.
What does the friction lock do?
The CTR adds a supplemental friction lock on top of the usual adjustment latch, which clamps the stock against the buffer tube once you've set your length. That takes out the rattle you get from a plain carbine stock, so the cheek weld stays consistent shot to shot. You release it to move the stock, then re-set it once you're happy with the length of pull.
How does it compare with the STR?
The CTR is the simpler and lighter of the two, giving you the friction lock and a clean profile without extra bulk. The STR adds water-resistant battery storage tubes and a dual friction lock for shooters who want to carry spares in the stock. If you don't need onboard storage, the CTR does the core job.
Which color should I go for, and is fitting straightforward?
Black, Flat Dark Earth, Olive Drab Green and Modified Coyote Brown are offered, all in the same reinforced polymer. Swapping stocks on a carbine tube is ordinary fitting work: the old stock comes off the tube and the CTR goes on in its place, with no permanent changes.
