There is an FAA/PMA approved rail mounted safety stop available that will prevent the possibllity of this sliding seat problem. Commonly available from a number of supply houses. Chief Aircraft (800-447-3408) at
www.cheifaircraft.com list it as PN:ATI-8701 for approx. $38 per pair.
Truthfully, I assumed that most folks knew about this product but if you don't have them installed ORDER A PAIR TODAY!! I have flown for years with them installed on the pilot side rails. Now I see the possiblity that a sliding co-pilot seat might be a hazzard if the occupant naturally grabbed the yoke. Just confirms why we need this forum...there's always more to learn from each other.