Manufacturer’s description:

Increase the capabilities of your MDT buttstock.

The Rear Bag Rider offers an end user an additional 5" to interface with a rear bag, or compliment multiple shooting positions. A flat, horizontal surface aids in linear recoil and the rounded profile reduces snagging on bags and gear. Mil-Spec Type III hard-black anodized aluminum. Attaches to M-LOK compatible and legacy buttstocks.