This is the Magpul AR-15 DT mil-spec carbine stock.

The DT Carbine stock is a drop-in replacement for firearms equipped with a Mil-Spec receiver extension tube.

Featuring dual tensioning technology, combining the best features of the SL and CTR stocks, the DT Carbine stock provides greater strength and stability that’s super easy to adjust.

• Compatible with Magpul ASAP®, ASAP® QD and other receiver-mount sling attachments
• Rear 1.25″ sling loop
• Rotation-limiting, integral push-button QD swivel sling mount accommodates up to 1.5″ swivels (ambidextrous)