Originally Posted by
GTifosi
From a purely observational standpoint, I don't see a drastic increase in bolt failures as a result of the ramped lugs.
The barrel extension lugs seem to hold up well with about that much 'squared' section and ramps behind them at the throat of the extension.
I know there are most likely some metalurgical differences between barrel extension and bolt, but beyond that, the revised shape shouldn't be too much of a factor as barrel extensions seem to outlast bolts by a pretty fair margin AFA outright breakage.