Fx.crown, FX Smooth Twist X barrel system

What is the distortion rate?What is the role of the tape in the picture?
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What happens if the o circle slides back and forth?

The three O-rings may come off / slide off the X liner and remain in the liner sleeve (when removing the liner). The user would have to shake them out or fish them out. Wouldn’t want those loose in there when trying to reinstall your X liner. The O-rings are there to prevent possible vibration within the X barrel system and they should be situated somewhere central when installed. They also may improve the barrels shooting harmonics.