You can find the Midwest SP Series Free Float M-LOK 9" Handguard Black here.

The Midwest Industries SP Series Free Float M-LOK Handguards are designed to be suppressor compatible. The one piece free float design is made of extremely durable 6061 aluminum and hard coat anodized. The top picatinny rail has T markings for accessory locations. The seven other side have M-LOK accessory slots along the length of the handguard. Includes barrel nut, mounting hardware, one five slot M-LOK polymer rail section and barrel nut wrench. Made in the USA.

Inside Diameter: 1.75"
Outside Diameter: 2.0"
Length: 9.2"
Weight: 10.2
Color: Black