The Magpul STR (Storage/Type Restricted) is a drop-in replacement buttstock 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.
Made in U.S.A.
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 Version.
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
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
Rear – Reversible QD swivel sling mount fits up to 1.5" push-button swivels (swivel not included)
Rear/Bottom – 1.25" sling loops
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.
Rockwell Arms stocks some of its firearms in its Sandpoint, Idaho store, but some firearms shown on the site will not be in stock in the store. If you would like to buy a particular firearm from the store, please call ahead to confirm it is in stock in the store.