There's nothing fundamentally impossible AFAIK - i.e. the rail itself doesn't have to do anything it can't, but you need the surface to survive enough shots to make it worthwhile.
For an actual weapon, this is potentially worth it at a pretty low number since the weapon itself will be pretty small. For a rocket accelerator sled this is going to be more of a problem (but like, conversely you could consider ideas like re-surfacing the rails in place since your turn around isn't fast).
For an actual weapon, this is potentially worth it at a pretty low number since the weapon itself will be pretty small. For a rocket accelerator sled this is going to be more of a problem (but like, conversely you could consider ideas like re-surfacing the rails in place since your turn around isn't fast).