Easily reproduced, minor visual bug caused by the player model glitching into the view of a any 2x(6x) optic, such as an RCO, ARCO, MRCO, etc while the player is crouched and moving while using the scoped reticle.
It causes it to be highly difficult to use due to a bug that has existed since Alpha and would take any very little time to correct.
So far, I have only encountered this issue with the Zafir using the 2x optics (6x) such as RCO, ARCO, MRCO.