The Magpul STR (Storage/Type Restricted) Carbine Stock – Mil-Spec 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 the USA.

Features:

• Collapsible Storage AR Stocks
• Platforms - AR10, AR15, M4, M16, M10, SR25
• Compatibility with Mil-Spec sized carbine receiver extension tube (no included) from manufacturers such as Colt, LMT, Ruger, S&W, SIG, and Others*.
• *Friction lock performance may vary depending on the host receiver extension's dimensional tolerances.
• *Specifications based on standard-length (flat-Back) Carbine receiver extension and may vary depending on tube manufacturer.

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.