Devices for the fixation of a bone fracture and methods of using the devices are provided. The devices comprise at least one distal pin assembly configured to engage a first bone fragment, at least one proximal pin assembly configured to engage a second bone fragment, and a rail bar system configured to connect the distal and proximal pin assemblies together across the bone fracture. Each pin assembly includes a screw portion having a distal end configured to engage first bone fragment and a proximal end, a support sheath portion having a distal end configured to engage the first bone fragment, wherein the support sheath portion defines an elongated channel in which the proximal end of the screw portion is disposed, and a cap portion configured to attach the proximal end of the screw portion to the support sheath portion.