| 21. | The rifle has a rotating bolt head with three lugs, which combine to provide an effective locking surface.
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| 22. | Cartridge / calibre changes can be accomplished by the change of a bolt head or complete bolt assembly.
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| 23. | It has a three-way selector between single, automatic fire, and milled parts were the barrel and the bolt head.
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| 24. | Friction in the threads and under the nut or bolt head use up some fraction of the applied torque.
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| 25. | Matching the nut shape to the shape of the bolt head is more a matter of esthetics than function.
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| 26. | This version had a new bolt head, an improved firing mechanism, modifications to the chambering, and a new rear sight.
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| 27. | The weapon features a semi-rigid two-piece bolt mechanism that consists of a bolt head and a supporting angular locking piece.
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| 28. | The bolt head is rotated by a control cam riding in a helical guide slot machined into the bolt carrier.
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| 29. | The blowback action Oerlikon SSG36 has a deep chamber in which the cartridge totally sinks along with the bolt head.
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| 30. | The bolt construction is significantly revised, allowing removal of the bolt head from the bolt body with simple hand tools.
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