The Renegade and Renegade Plus use a unique mounting and locking system for the handguard. The narrow profile handguard is slipped over the barrel nut and locked horizontally into place using two QD sling mount blocks: one on the right side and one on the left side. Additionally, two clamp screws located at the bottom of the handguard are tightened to effectively clamp the handguard into place.
Once the handguard is slid into position the cutout in the barrel nut should be visible in the window of the handguard as shown here.
The square “block” on the sling mount will fit into the window of the handguard and “lock” into the barrel nut. While holding the block forward against the barrel nut, the two screws are then tightened on the QD sling mount block to 25 inch-pounds. This process must be followed on both the right and left side of the weapon.