Subclass 3/24: Breech mechanism, e.g. locks Bolt action, i.e. the main breech opening movement being parallel to the barrel axis Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively the locking elements effecting a rotary movement about the barrel axis, e.g. rotating cylinder bolt locks hand-operated the locking being effected by rotating the operating handle or lever transversely to the barrel axis the locking elements forming part of the operating handle or lever