Quote Originally Posted by Surpmil View Post
Since the bolt ways are not likely to be of identical diameter, perhaps a mandrel split into four for part of its length and bored and tapped slightly undersize for a bolt would allow the mandrel to be "spread" and grip the boltway behind the locking lugs, which is almost the only place it has much support.)
Or maybe at the rear the mandrel could be made 20 thou undersized to allow a brass or steel bushing made to fit the individual rifle to be sleeved over? Hmmm...