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.
In the original form, with the earlier softer steel barrels, IMO it was much more than merely a theoretical advantage. With modern high-strength heat-treated barrels OTOH it's probably a somewhat of a moot point. Please see John Buhmiller's attempts to blow up high walls as recounted by him (Buhmiller) in Simmons'
Custom Built Rifles. As Arte Johnson used to say, "Veeerrry in-ter-est-ing!"
GM barrels are no better or worse than any other quality barrels, they've set plenty of national records and won plenty of national matches in more than one shooting discipline. They continue to be a good choice, IMO as good as Douglas or Shilen any day. I've been using them for over 10 years with good satisfaction and will continue to use 'em in any appropriate application. I especially like the little breech tulip left on many of their octagon barrel blanks, IMO it really sets off a nice rifle very well.
Regards, Joe
