(under subclass 125) Guns in which a breech block, having rectilinear motion only, is not locked, but is resiliently held in breech closing position solely by its own inertia and its recoil or return spring.
(1) Note. Classification is in this or indented subclasses where the claims are limited to the mounting of the breech block, even though a breech block lock is disclosed.
(2) Note. Guns in which a breech lock or retarding means is released by some means after which the breech block is moved back by blow back are classified on the type of the locking or retarding means claimed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4.5, for explosion opened breech guns of the blow back type.
183, for inertia operated locks initiated by limited blow back of the breech block.
