distance each time the gun is fired. Such an excessive reciprocating motion of the cylinder would be entirely out of the question in any high-ratc-of-fire rotarv action mechanism.

Dating from about the turn of the century, there have been several instances of a rather clever type of rotary chamber mcchanism which makes it possible to use conventional ammunition in such a way that the principle of neck sealing can be employed without the necessity for imparting a reciprocating motion to the cylinder itself. In this mechanism, the cylinder is mounted and rotated in the conventional manner but until a chamber reaches the firing position, the round in that chamber is not pushed all the way home (fig. 4—9). When the chamber does reach the firing position, a sliding bolt drives the


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