The Magpul STR (Storage/Type Restricted) is a drop-in replacement buttstock for AR15/M16 carbines using commercial-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 commercial-spec sized carbine receiver extension tube (not included) from manufacturers such as Bushmaster, DPMS, Olympic, 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 Type 1 Sling Mount fits up to 1.5" push-button QD swivels (swivel not included)

  • Rear/Bottom – 1.25" sling loops

Optional Accessories**

• Extended Rubber Butt-Pad, 0.55"

• Enhanced Rubber Butt-Pad, 0.70"

• Dual-side push-button QD swivel Type 2 Sling Mount

Specifications**

• STR, Commercial-Spec (stock configuration)

  • Weight: 0.77 lb.

  • Weight, w/ Rec. Extension: 1.10 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 mil-spec extension on your rifle, make sure to order the Mil-Spec STR. Please see the "Related Info" section above to determine which tube you have.

* Friction lock performance may vary depending on the host receiver extension's dimensional tolerances.

** Specifications based on extended-length (slant-back) commercial-spec 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.