MagPul Stock CTR Collapsible AR-15 Carbine Synthetic FDE MilSpec – MAG310-FDE

The Magpul Stock CTR Collapsible AR-15 carbine stock in synthetic Flat Dark Earth is a mil spec pattern replacement that upgrades a standard carbine stock without changing anything about how your rifle runs. The CTR has been the default upgrade on countless AR builds for years, and the FDE color makes it an easy match for tan and earth toned furniture sets. It is the sensible, proven choice.

What the Magpul Stock CTR Collapsible Stock Fixes

Standard issue carbine stocks work, but they wobble on the buffer tube and they offer very little in the way of a cheek weld. That wobble is the complaint most shooters have with a factory AR, and it is entirely a stock problem rather than a rifle problem.

A quality collapsible stock removes that slop and gives you a firmer, more repeatable interface with the rifle. That translates directly into a more consistent cheek weld, which translates into a more consistent sight picture.

It suits anyone with a mil spec buffer tube who wants a meaningful ergonomic upgrade at modest cost, whether the rifle is a range gun, a home defense carbine, or a duty build.

Key Features

• Magpul Stock CTR Collapsible design with multiple length of pull positions for different shooters and gear
• Mil spec pattern sizing to fit standard mil spec carbine receiver extensions
• Synthetic construction that is light, weatherproof, and resistant to solvents
• Flat Dark Earth color molded through the material rather than painted on
• Compact, snag free profile that clears plate carriers and slings
• Straightforward installation with no permanent modification to the rifle

Fit, Materials, and Getting the Right Buffer Tube

The single most important compatibility check is the buffer tube. This stock is the mil spec version, which fits a mil spec diameter receiver extension. Commercial spec tubes are slightly larger in diameter and slightly different in taper, and a mil spec stock will not seat correctly on one.

If you are unsure which you have, measure the outside diameter of the tube where the stock rides. Mil spec tubes run about 1.146 inches and commercial tubes run about 1.168 inches. That small difference decides whether the stock slides on cleanly or fights you the whole way.

Synthetic construction is what makes the FDE finish practical. The color goes through the material rather than sitting on top of it, so scuffs and wear do not expose black plastic underneath the way a painted stock would. More on the Magpul furniture ecosystem is available at Magpul.

Practical Use, Care, and Setup

Installing the Magpul Stock CTR Collapsible stock takes about a minute. Depress the adjustment lever fully, slide the old stock off the receiver extension, slide the new one on, and verify it locks positively into each position along the tube.

Set your length of pull deliberately. Shorter positions suit shooters wearing armor or heavy layers, longer positions suit a bare shirt at the range, and most people run the stock one notch shorter than they think they need once they start shooting from awkward positions.

Maintenance is essentially nothing. Wipe the stock down, keep grit out of the buffer tube channel, and check the lock lever engagement occasionally. If you are matching the rest of your furniture to Flat Dark Earth, our parts and upgrades category carries grips, handguards, and hardware in coordinating colors.

Why It Stays Popular

Some parts stay on the market because they were early. This one stays because it does exactly what an AR stock should do at a price that makes it an obvious swap, and because it has been proven on more rifles than almost any aftermarket component in the category.

Solid, light, adjustable, and available in a color that actually matches your build. Ships direct to your door, no FFL required.