This Desert Tech Handgaurd for the MDR rifle was specifically designed to accommodate the use of large muzzle devices such as suppressors, and features a durable glass reinforced polymer construction. The internal diameter is oversized, and is compatible with most suppressors with a 1.75 inch diameter. The length has also been extended for use with longer barrels, and features M-LOK attachment points in the 3 o'clock, 6 o'clock, and 9 o'clock position for the installation of lights, lasers, fore-grips and other accessories. Features of the Desert Tech MDR OTB Suppressor Handguard Internal diameter 1 7/8 inchesM-LOK attachment points in the 3 o'clock, 6 o'clock, and 9 o'clock positionsFast and easy installation Desert Tech MDR/WLV Reflex Handguard Assembly BLK MDR0374-B