Maybe the Owen was the ugliest gun ever made, but it wasn't made, or loved by those who carried it, for it's looks.
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In July 1939 a 24 year old by the name of Evelyn Owen took his prototype of a .22 calibre submachine gun (sometimes called a machine carbine) to the Victoria Barracks in Sydney.
It was inspected by Ordnance Officers. It could be made with little special equipment using the parts from a .22 calibre rifle.
The Officers told Owen that in would not be accepted by the Army because it was .22 calibre. Owen said that the gun could be easily adapted to larger calibres and that he only chose .22 for convenience.
The gun was rejected because, before World War II the Australia Army did not realise that the submachine gun was very important in attacking and defensive roles.
Also, the British Army hadn't adopted the submachine gun into their Army, but . . . the war started, we needed weapons and more importantly
we needed jungle fighting weapons, so . . . .
The Owen went into production about mid 1941, with about 50,000 produced by 1945.
Although quite large and bulky, the Owen was a first-class gun and very popular with those who used it. It stood up well to the hard conditions of jungle fighting and stoppages were remarkably rare.
Its two outstanding features were the top mounted magazine -- a feature rarely seen on submachine-guns since the Villar Perosa -- and the provision of a separate bolt compartment inside the receiver so that the bolt was isolated from its retracting handle by a small bulkhead, through which passed the small diameter bolt.
This ensured that dirt and mud did not jam the bolt and it was highly successful, although expensive in terms of space.
Two other unusual mechanical features: the ejector is built into the magazine rather than into the gun body, and the barrel is rapidly removable by pulling up on a spring-loaded plunger just ahead of the magazine housing.
The latter feature is necessary since, due to the method of assembly and construction, the gun can only be dismantled by removing the barrel and then taking out the bolt and return spring in a forward direction.
The OMC stayed in service through Korea (where the extra distances and the extra bulkypadded winter clothing of the enemy worked against it) and in the early days of Vietnam. It was replaced by a newer less efficient model, the F1, in the 1960's and that was quickly replaced by the American made Colt AR15 (M16) Armalite.