The Magpul STR is a drop-in collapsible buttstock designed for AR-15/M4 carbines using mil‑spec receiver extension tubes. This storage-capable version of the CTR improves cheek weld and integrates two water-resistant battery tubes in a compact, reinforced polymer A-frame. The STR includes two integral sling loops, a reversible push-button QD sling mount, and a replaceable 0.30″ thick rubber butt-pad that helps maintain secure shoulder purchase with gear. The stock requires a mil‑spec receiver extension tube; the tube is not included.
Key Specifications
- Finish is OD Green.
- Material is Polymer.
- Fit is AR-15 / M4 with mil-spec receiver extension tubes.
- Adjustment type is Collapsible.
- Provides 6 positions for length-of-pull adjustment.
- Length of pull ranges 10.90″-14.20″.
- Tube included: No.
- Features include water-resistant battery storage tubes.
- Mounting includes two integral sling loops and a reversible push-button QD sling mount.
- Replaceable butt-pad thickness is 0.30″.
Purpose-built for shooters who want a compact, storage-capable stock that improves handling and supports accessory integration, the STR combines practical storage, user-friendly controls, and durable construction. Its reinforced polymer A-frame, anti-slip butt-pad, and versatile sling options make it a sensible upgrade for range use, training, or duty applications.
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