This is a Magpul Industries Brace known as the BTR, model MAG1079-BLK.
The Magpul BTR is an AR arm brace designed to improve the single-handed employment of large-format pistols. The BTR utilizes Magpul design and engineering to offer a stabilizing accessory with a robust feature set and trusted Magpul quality. With classic Magpul aesthetics" the BTR is compatible with Mil-Spec carbine receiver extensions and employs a simplified" durable" and easy to use adjustment mechanism. An integrated QD cup and M-LOK compatible slot provide ambidextrous sling mounting options and enable stabilizing sling tension to be applied" drastically increasing single-handed control of the firearm. With a straight-forward design and Magpul innovation" the BTR is a simple solution to improving your AR pistol.
Features:
IMPROVES SINGLE-ARMED USE OF LARGE-FORMAT PISTOLS
M-LOK compatible slots for additional sling mounting options
Toolless, single-handed adjustment
High-strength polymer and metal construction
