CTR® COLLAPSIBLE MIL-SPEC CARBINE STOCK FOR AR-15 Reviews & Ratings

The Magpul CTR (Compact/Type Restricted) – Mil-Spec model is a drop-in replacement buttstock for AR15 / M16 carbines using Mil-Spec sized receiver extension tubes. Designed for light, fast action, the streamlined A-frame profile avoids snagging and shields the release latch to prevent accidental activation.

The CTR also features a supplemental friction lock system that minimizes excessive stock movement for enhanced weapon stability and an ambidextrous QD sling mount that will accept any push-button sling swivel. The Mil-Spec model includes a standard 0.3"" thick rubber butt-pad, which provides positive shoulder purchase to prevent slippage even with body armor or modular gear.

FEATURES

Mounts on Mil-Spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others (please see the note below)
Shielded release latch prevents snagging and accidental operation while the supplemental friction lock minimizes accuracy-robbing wobble
Sloping cheek weld combines a slim profile with user comfort
Compatible with Magpul CTR® Cheek Risers for use with a fully extended stock and on rifles without rear-facing charging handles
Premium chrome-silicon lock spring provides positive locking and long life
Compatible with Magpul ASAP®, ASAP® QD and other receiver-mount sling attachments
Removable 0.3"" Rubber Butt-Pad offers an anti-slip surface and increases impact protection
Rear - Push-button QD swivel sling mount accommodates up to 1.5"" swivels (ambidextrous)
Rear/Bottom - 1.25"" sling loops
Toe - Lanyard hole for custom para-cord rigs
Made in the USA.

SPECS

Collection: Collapsible Non-Storage AR Stocks
Platform: AR10, AR15, M4, M16, M110, SR25
Compatibility: Mil-Spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others*
LOP, M4 Collapsed: ~10.5 in.
LOP, M4 Extended: ~13.8 in.
LOP Adjustment Range: 3.3 in.
Length, max: 6.9 in.
Weight: 9.0 oz.
Weight, w/ receiver extension: 13.0 oz
Friction lock performance may vary depending on the host receiver extension's dimensional tolerances.
Mil-Spec fits smaller 1.14" O.D. buffer tubes on Colt-manufactured M4 and similar mil-spec carbines.
Black and Flat Dark Earth Models are TACOM approved and on the Additional Authorization List (AAL) for the M4/M4A1.
Black NSN 1005-01-614-7778
Flat Dark Earth NSN 1005-01-616-4923

NOTE: There are two basic sizes of M4 Carbine receiver extensions (buffer tubes): Mil-Spec and Commercial-Spec. If you have a Commercial-Spec extension on your rifle, make sure to order the Commercial-Spec CTR. Specifications based on standard-length (flat-back) M4 Carbine receiver extension and may vary depending on tube manufacturer.

See all of our AR15s and AR15 parts here.

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Reviews Summary

The Magpul CTR® Collapsible Mil-Spec Carbine Stock receives overwhelmingly positive feedback for its durability, stability, and ease of installation. Users appreciate the friction locking mechanism that eliminates wobble, making the stock feel solid and comfortable. Some note minor fit issues but generally consider it a significant upgrade over standard AR stocks, providing excellent value for money.

What Reviewers Are Saying

Product Quality

85%

Reviewers consistently praise the overall quality of the Magpul CTR stock. It is noted for its durable construction, excellent fit, and high performance, making it a reliable choice for AR-15 users. Many emphasize that the quality matches or exceeds expectations, being a staple in the industry.

Stability and Locking Mechanism

75%

Users frequently highlight the effectiveness of the friction locking mechanism, which significantly minimizes any play in the stock. This ensures a tight fit on the buffer tube, which enhances the overall shooting experience, making it a preferred feature among users.

Ease of Installation

65%

Many reviewers commend the simple installation process of the CTR stock, often noting that it easily slides onto the buffer tube without complication. This ease of use adds to the product's appeal, making it accessible for users at all skill levels.

Comfort and Ergonomics

60%

The comfort of the CTR stock is frequently mentioned, with users appreciating its ergonomic design and the incorporated rubber butt pad. The stock’s design enhances the overall shooting experience, making it a comfortable option for various applications.

Value for Money

70%

Customers find the CTR stock to be a great investment, considering its robust features and quality relative to its price. Many reviews indicate that it offers superior performance compared to cheap alternatives, affirming that purchasing the CTR is money well spent.

Aesthetic Appeal

50%

Several users mention the aesthetic qualities of the CTR stock, noting that it comes in various colors and looks great on their firearms. This visual appeal complements its functionality, enhancing the overall satisfaction of ownership.

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Great

Locks up nice..

by THOMAS D. on August 17, 2026

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Much better than the M4 milspec standard

Another great Magpul product: well thought out, affordable, durable, and good ergonomics. For my long range builds I use a PRS or PRS Lite, but for my 10.4in "truck gun" I like the way the CTR collapses and stows away. A lot lighter and better cheek-weld than the M4 buttstock.