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(10 customer reviews)


The Magpul STR (Storage/Type Restricted) is a drop-in replacement buttstock for AR15/M4 carbines using mil-spec sized receiver extension tubes. A storage-capable version of the CTR®, the STR has improved cheek weld and two water resistant battery tubes on a compact, reinforced polymer A-frame design.

A shielded operation lever and supplemental friction locking system prevent accidental operation and minimize excessive stock movement for enhanced weapon stability and accuracy.* The STR incorporates two integral sling loops, a reversible push-button QD sling mount, and a replaceable 0.30″ thick rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear.

Made in U.S.A.


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)
Two water-resistant battery storage tubes located on the left and right sides of the stock

Each tube will store up to two (2) CR123A lithium or AA batteries
Tubes are accessible from the rear in any stock position via a hand-removable rubber plug

Supplemental friction lock minimizes accuracy robbing wobble*
Premium chrome-silicon lock spring provides positive locking and long service life
Sloping cheek weld provides a wide contact surface for user comfort
Shielded release latch prevents snagging and accidental operation
Replaceable 0.30″ Rubber Butt-Pad offers an anti-slip surface and increases impact protection
Compatible with Magpul ASAP®, ASAP® QD, and other receiver-mount sling attachments
Sling Mounts

Rear – Reversible Type 1 Sling Mount fits up to 1.5″ push-button QD swivels (swivel not included)
Rear/Bottom – 1.25″ sling loops

ITARInternational Traffic in Arms Regulations Controlled Product

STR Carbine Stock, Mil-Spec

Weight: 12.3 oz.
Weight, w/receiver extension: 16.3 oz.
Length, max: 7.3 in.
Width, max: 2.6 in.
LOP Adjustment Range: 3.3 in.
LOP, M4 Collapsed: ~11.1 in.
LOP, M4 Extended: ~14.4 in.

* Friction lock performance may vary depending on the host receiver extension’s dimensional tolerances.** Specifications based on standard-length (flat-back) M4 Carbine receiver extension and may vary depending on tube manufacturer.

Additional information

Weight 14.39177648812 oz
Dimensions 6 × 4 × 2 in

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10 reviews for Magpul STR® CARBINE STOCK – MIL-SPEC

  1. Beans (verified owner)

    Nice alternative to the CTR, wide cheek weld similar to SOPMOD stocks

  2. Jeremy Doan (verified owner)

    Solid stock, with a good lockup and nice cheek weld. I got mine shipped pretty fast.

    The storage tubes are tiny, so cr123a’s are really the only thing you can fit. Comes with one qd cup installed in the rear. It’s a bit weighter than your regular ctr.

  3. trevs99teg (verified owner)

    Really liking this stock and i am going to replace my ctr on my colt to this str as i like the cheek rest sooooo much better

  4. michoel.dovid.leopold (verified owner)

    Solid piece. Like the wider cheek rest, also being able to hold batteries is a nice add on.

  5. michoel.dovid.leopold (verified owner)

    Like the wider cheek weld and battery storage.

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