Magpul® STR® Carbine Stock – Mil-Spec

(35 reviews)
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Magpul STR Carbine Stock, Mil-Spec

The Magpul STR (Storage/Type Restricted) is a drop-in replacement butt stock for AR15/M16 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" rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear.

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 STR. Please see the "Related Info" section above to determine which tube you have.

Made in the 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® and other receiver-mount sling attachments
  • Sling Mounts
    *Rear: Reversible QD swivel sling mount fits up to 1.5" push-button swivels (swivel not included)
    *Rear/Bottom: 1.25" sling loops

Optional Accessories**

  • Extended Rubber Butt-Pad, 0.55"
  • Enhanced Rubber Butt-Pad, 0.70"


  • STR, Mil-Spec (stock configuration)
  • Weight: 0.77 lb.
  • Weight, w/ Rec. Extension: 1.02 lb.
  • Length, Maximum: 7.30 in.
  • Width, Maximum: 2.58 in.
  • LOP Adjustment Range: 3.25 in.
  • LOP, M4 Collapsed: 11.10 in.
  • LOP, M4 Extended: 14.35 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.

***Standard Rubber Butt-Pad, 0.30" weight: 0.08 lb. Optional Extended Rubber Butt-Pad, 0.55" (weight: 0.11 lb.) or Enhanced Butt-Pad, 0.70" (weight: 0.13 lb.) may be used with either Mil-Spec or Commercial-Spec STR stocks.


  • 5

    Posted by Michael Jackson on 1st Mar 2022

    Magpul makes great stuff, I’ve never had an issue with them and this particular stock feels gorgeous on the shoulder and against the cheek, I have Black and Tan

  • 5
    STR Carbine Stock-Mil-Spec

    Posted by Thomas Blackmon on 7th Aug 2021

    This stock combines the rock-solid friction lock of the CTR and cheek weld/storage of the SOPMOD, while still being compact. It was ordered Wednesday evening and arrived on Saturday morning. SKD continues to be an outstanding outfit!!!!!!!

  • 5
    Awesome Stock

    Posted by A.J on 17th Jul 2020

  • 5

    Posted by JP on 14th Aug 2018

    Great stock. Only SKD had it in stock in black!

  • 4
    Good stock

    Posted by Aaron on 8th Apr 2018

    Comfortable stock, great for predator calling.

  • 5
    Excellent stock

    Posted by Meeks on 19th Sep 2017

    Very pleased with the product. I am very excited to use this stock on my AR build.

  • 5
    Love this stock!

    Posted by Drygulcher on 17th Jan 2016

    Replaced my Colt Rogers stock with the Magpul. The swivel socket is too low on the Rogers and perfectly placed on the STR. Plus the storage and superior cheek weld on the Magpul make it the best stock out there.

  • 5
    Great stock, especially for an A5 tube

    Posted by Joseph M on 17th Jan 2016

    If you have an A5 length receiver extension, this is the perfect stock for it. Just the right length, storage, and high strength. Highly recommended.

  • 5
    Great gear

    Posted by Unknown on 29th Dec 2015

    Great site to purchase tactical gear.