FAB Defense VFR-VZ - Manual (Page 4)

Step 5. Place the Lower Handguard (2) into the front hoop of the Receiver, then push it
forwards [1] and upwards [2] as shown in Fig 6.
Step 6. Insert the Rivet (5) into the Receiver and flatten the edges with a Hammer (Fig
7).
Step 7. Place the Upper Handguard (1) on the Lower Handguard (2) and tighten the
four Connecting Bolts (7) Using the Allen Key (4) as shown in Fig 7.