Fitting Rifle Bolts

[Surpmil]

Was abrasive lapping of the lugs and shoulders against each other part of the final fitting process? It would I suppose cause some wear to the hardened surfaces of the shoulders, but surely the unhardened lugs of the bolt would wear in much more quickly?

Hand stoning by eye does not seem a very efficient method even with the use of engineer's blue.

"figure", as in "...gauged for ... figure" refers to what; eyeballed for overall fitness and appearance or actually gauged for some specific dimension?