Brent, I can't speak to the preferability of flatpring vs. coilspring primer ignition. But HiWalls have a comparatively small barrel shank opening, i.e., .93" vs. the usual 1" or more of bolt actions. The flatspring has a thin web under the barrel shank where there is a hole for the spring to pass through. The coil version is solid. Granted that this was thought up to allow a takedown action, but it is at least a theoretical advantage.