This is a Midwest Industries Handguard known as the Combat Rail M-Lok, model MI-CRM7.
Midwest Industries is a proven leader in the firearm industry. Made in America" focusing on the small details to make your rifle platform better. The addition of their Combat rail series of handguards to your rifle platform creates the rail space you need to add your accessories and change the feel of your rifle with a new streamline design. This Combat Rail M-LOK 7" Handguard has a continuous Mil-Std 1913 Picatinny top rail and two integral anti-rotation QD sling sockets. Five slot polymer M-LOK rail included. Seven sides of M-LOK.
Features:
Super Slim 1.3 inside diameter
Features Patented 4140 Heat Treated Torque Plate
Two Integral Anti-Rotation QD Sling Sockets
Fits AR rifles
7"