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The Magpul STR (Storage/Type Restricted) is a drop-in replacement butt stock for AR15/M16 carbines.  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. Drop-in replacement for the standard M4 stock. Two water resistant battery tubes that can be accessed by hand in any stock position (holds two CR123A or AA batteries per side). Reinforced polymer construction. A-frame design with improved cheek weld. Compact design is shorter and lighter than the ACS Stock. Shielded release latch and supplemental friction lock. Compatible with Magpul ASAP® and other receiver-mount sling attachments. Reversible push-button QD sling mount. Replaceable butt-pad offers an anti-slip surface and increases impact protection. Kit includes a 6 position commercial buffer tube, castle nut, stock plate, carbine buffer and spring. Available in Black and Dark Earth. Buffer upgrades available.