Befähigungsprüfung Waffengewerbe (Büchsenmacher) Practice Questions - Befähigungsprüfung Waffengewerbe (Büchsenmacher) (Austria) Exam

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How does the radial locking system (Radialbundverschluss) in straight-pull bolt actions (e.g. Blaser R93 / R8) secure the breech under chamber pressure?

By rotating a multi-lug bolt head 60 degrees into corresponding locking recesses inside the receiver ring. Through a 360-degree radially expanding collet (Spreizhülse / radial expanding elements) that locks directly into an annular groove cut into the barrel extension. Via dual vertical locking wedges that drop into recesses in the bottom of the action block. By utilizing a toggle-link mechanism identical to the Maxim machine gun.

Correct Answer:

Through a 360-degree radially expanding collet (Spreizhülse / radial expanding elements) that locks directly into an annular groove cut into the barrel extension.

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