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" rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear.
Made in U.S.A.
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
Rear – Reversible Type 1 Sling Mount fits up to 1.5" push-button QD 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.
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.
* 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" or the optional Extended Rubber Butt-Pad, 0.55" and Enhanced Butt-Pad, 0.70" may be used with either Mil-Spec or Commercial-Spec STR stocks.