Perhaps having the threaded barrel was a design choice from the outset. The anticipation of having a common receiver with variable length of barrel options.
In any case, I suspect that the barrel alone is designed sufficiently to contain the pressures encountered. The strength of the receiver is accounted as "extra margin of safety" from a design point of view. The reason I say this is by comparison to barrels in other handguns that I own. Specifically, my CZ52 which fires the hot (1600fps) 7.62x25 round has a chamber wall thickness of about .100" thick, the remaining part of the barrel is .08" thick.
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Carpe Diem, Parabellum
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