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.
| Compatibility | Mil-Spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others |
|---|---|
| LOP, M4 Collapsed | ~10.9 in. |
| LOP, M4 Extended | ~14.2 in. |
| LOP Adjustment Range | 3.3 in. |
| Length, max | 7.3 in. |
| Weight | 12.3 oz. |
| Weight, w/ receiver extension | 16.3 oz. |
| Width, max | 2.6 in. |
| Other Specs | * 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. |
