This is a Midwest Industries Handguard known as the G2 Two Piece, model MCTAR-18G2.
Midwest Industries AR Mid-Length MI Gen2 Two Piece Drop-In-Handguard installs like factory plastic handguards. 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 drop in handguard to your rifle platform creates the rail space you need to add your accessories. It has Gen2 design with four anti-rotation QD sockets for push button swivels. It is constructed from 6061 aluminum hard coat anodized and compatible with most gas piston systems.
Features:
No gunsmith required
Installs like factory plastic handguards
Incredibly light weight
High quality 1913 mil spec rails
4-rail handguard