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.

Made in U.S.A.

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)
   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"

Specifications**

   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.

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.