Sometimes the forend screw is overtightened, pushing the steel ferule (in the forearm) too deep, causing some sloppiness, you are not missing any parts. The barrel usually touches the barrel channel, and the forearm screw is just "snugged" up. I've epoxied the ferule back in place on some, but putting a rubber o-ring between the barrel and forearm works too. There's no real free-floating option with the 99's beyond the o-ring. I've considered retrofitting a strong-arm bracket like the Browning BLR has, but that's a radical (unlikely) change for any 99 with the rotary magazine.