This is a Midwest Industries Rail known as the Forearm Mount, model MCTAR-03.
Midwest Industries Long Picatinny Rail Forearm Mount will fit AR series handguards with large or small holes. 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 rail sections to your rifle platform creates the rail space you need to add your accessories.
Features:
Hard coat anodized 6061 aluminum construction
In most circumstances you will be able to use standard heat shields after installation
Easy install
