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
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
Replaceable0.30" Rubber Butt-Padoffers an anti-slip surface and increases impact protection
Compatible with MagpulASAP®, ASAP® QD, and other receiver-mount sling attachments
Rear – ReversibleType 1 Sling Mountfits up to 1.5" push-button QD swivels (swivel not included)
Rear/Bottom – 1.25" sling loops
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.
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: ~10.9 in.
LOP, M4 Extended: ~14.2 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.