Magpul CTR Carbine Stock Mil-Spec for AR-15/M4
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Fits AR-15/M4 rifles with a Mil-Spec-diameter carbine receiver extension (buffer tube). Check your tube specification before ordering.
Not sure it fits your rifle? Ask us before you order
The Magpul CTR is a mil-spec collapsible carbine stock for AR-15 and M4 rifles, fitting any Mil-Spec-diameter receiver extension.
The carbine stock that professionals default to — the CTR kills wobble and gives you the same cheek weld every single time.
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 duty rifles and serious training carbines for a simple reason: it removes variables, and consistent shooting is built on removed variables.
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 ordering. Fitting is the usual stock swap — depress the lever, seat the stock, then engage the friction lock and feel the difference immediately.
| 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 |
| Brand | Magpul Industries |
| MPN | MAG310-BLK · MAG310-FDE · MAG310-ODG · MAG310-MCB |
The professional's default for a reason. Order the CTR Carbine Stock today — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.
Explore more: Rifle & Shotgun Stocks, Precision Rifle Stocks, AR-15 Parts or browse all Magpul.
| 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 |
| Brand | Magpul Industries |
| MPN | MAG310-BLK · MAG310-FDE · MAG310-ODG · MAG310-MCB |
| Category | Rifle Stock |
| Shipping weight | 0.5 kg |
| Barcode | 873750001500 |
£5 tracked UK delivery on every order via Royal Mail Tracked 24. Our products are ordered in from the manufacturer rather than held in UK stock, so please allow 7 to 10 business days (Monday to Friday, excluding bank holidays) from the date of your order for it to reach you. Tracking details are emailed on dispatch. UK delivery only.
You have 30 days from receiving your order to cancel it for any reason, then 14 days to send it back unused and in its original packaging. Faulty, damaged or incorrect items are replaced or refunded and we cover reasonable return postage. Refunds go back to your original payment method within 14 days of receiving the return.
It fits AR-15/M4 rifles running a Mil-Spec-diameter carbine receiver extension, which is the common commercial 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 ordering. If you're unsure which you have, get in touch with details of the rifle before ordering.
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.
The CTR is the simpler and lighter of the two, giving you the friction lock and a clean profile without extra bulk. The <a href="/products/magpul-str-carbine-stock-mil-spec-ar15-m4">STR</a> 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.
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. For a wider comparison, see our <a href="/blogs/buying-guides/choosing-an-ar-15-stock">guide to choosing an AR-15 stock</a>.
Stocks are sent from the United Kingdom with £5 tracked UK delivery in 7–10 business days, and you'll get tracking by email when it ships. If a part turns out to be the wrong fit, see our returns policy or <a href="/pages/contact">contact us</a> and we'll help sort it.
7 to 10 business days from the date of your order. Every order is sent Royal Mail Tracked for a flat £5 and you receive tracking details by email when it is dispatched.
Yes. We list only genuine parts and optics from the brands shown, ordered in from the manufacturer for your order.
Compatibility notes on this page come from the manufacturer. If you are unsure, email us with your make and model before ordering and we will check rather than guess.
Yes. Bundle & Save applies automatically in your basket: 5% off when you buy 2 items, 10% off at 3 items and 15% off at 4 or more. It works across the whole range, so you can mix and match, and there is no code to enter.
Yes — you have 30 days from delivery to cancel for any reason, as long as the item is unused and in its original packaging. See our returns policy for the details.
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