Description
The Magpul DT Carbine Stock takes the wobble complaint most folks have with basic mil-spec collapsible stocks and puts it to bed. It's a drop-in replacement buttstock for AR-15, M16, and M4 carbines running a standard mil-spec profile receiver extension, and the big story here is Magpul's Dual Tensioning technology. Instead of relying on just a single lock pin dropping into a notch on the tube, an internal auto-engaging friction lock adds extra tension against the buffer tube, so the stock stays put with no rattle when you shoulder the rifle.
What the Dual Tension System Does on the DT Carbine Stock
The friction lock is reflexive and inert during adjustment, meaning it grabs on its own without you ever fiddling with a separate manual lock. That tight lockup minimizes movement between the lock pin and the receiver extension, which pays off two ways: better durability if the rifle takes a hard knock, and smoother, faster length-of-pull changes on the fly. A single ambidextrous lever handles the adjustment, running from roughly 10.5 inches collapsed out to about 13.8 inches extended.
Ergonomics and Sling Options on the FDE DT Stock
Magpul pulled the best bits from two of their proven lines to build this one. It borrows the footprint of the SL stock and the optimized butt-pad curvature from the CTR, giving you a non-slip pad that transitions smoothly across the shoulder and fits better when you're running body armor. The sloping cheek weld and slim profile keep things comfortable, and it accepts Magpul CTR Cheek Risers if you want to bump up your comb height for optics.
Sling mounting is flexible too. There's a rotation-limiting integral push-button QD swivel mount that's ambidextrous, plus a rear 1.25-inch footman's loop for running webbing. Built from durable reinforced polymer and made in the USA, this Flat Dark Earth finish is a clean match for a tan or earth-toned build. Keep in mind the mil-spec receiver extension tube is not included, so you'll want to have that on your lower already.
Key Specifications
- Manufacturer: Magpul Industries
- Model: DT Carbine Stock
- Manufacturer Part Number: MAG1377-FDE
- UPC: 840815147558
- Color: Flat Dark Earth
- Fit: AR-15/M16/M4 Mil-Spec Receiver Extension
- Style: Collapsible A-Frame Carbine
- Material: Reinforced Polymer
- LOP Collapsed: Approx. 10.5 in
- LOP Extended: Approx. 13.8 in
- Weight: Approx. 9.8 oz (stock only)
- Max Length: 7.0 in
- Max Height: 5.3 in
- Sling Mount: Ambidextrous QD Swivel Mount plus 1.25 in Footman's Loop
- Cheek Riser Compatible: Magpul CTR Cheek Risers
- Country of Origin: Made in the USA
What’s Included
- Magpul DT Carbine Stock (Mil-Spec, Flat Dark Earth)
Frequently Asked Questions
Will the DT Carbine Stock fit my buffer tube?
It's built for standard mil-spec profile receiver extensions, which are the most common tubes on AR-15, M16, and M4 lowers. It will not fit commercial-spec tubes, which run a slightly larger diameter. If you're unsure which one you have, mil-spec measures about 1.148 inches at the outer diameter versus roughly 1.168 for commercial.
Does the Magpul DT Carbine Stock come with a receiver extension tube?
No, the tube is not included. This is a drop-in stock only, so you'll need a mil-spec buffer tube, buffer, and spring already installed on your lower. If you're building from scratch, grab a complete carbine receiver extension kit to go along with it.
What makes the Dual Tension system different from a regular CTR stock?
The DT adds an internal auto-engaging friction lock that tensions against the buffer tube on its own, without a manual secondary lock like the CTR uses. That means you get the anti-wobble benefit automatically every time you shoulder the rifle. It's a cleaner, more foolproof approach to eliminating stock rattle.
Can I add a cheek riser to the DT Carbine Stock?
Yes, it accepts Magpul CTR Cheek Risers for raising your comb height to line up behind an optic. Keep in mind that on standard AR-15 platforms the riser is best used with the stock fully extended, since it can interfere with a rear-facing charging handle otherwise.






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