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| Owen submachine gun | |
|---|---|
| Name | Owen submachine gun |
| Type | Submachine gun |
| Origin | Australia |
| Service | 1942–1960s |
| Designer | Evelyn Owen |
| Design date | 1939–1941 |
| Manufacturer | Lithgow Small Arms Factory; others |
| Production date | 1942–1961 |
| Number | ~45,000 |
| Weight | ~4.3 kg (unloaded) |
| Length | 875 mm |
| Cartridge | .45 ACP |
| Caliber | .45 in (11.43 mm) |
| Action | Blowback, open bolt |
| Rate | 700–720 rounds/min |
| Feed | 34-round detachable box magazine (top-mounted) |
| Sights | Iron sights |
Owen submachine gun
The Owen submachine gun, designed by Evelyn Owen and produced by the Lithgow Small Arms Factory, was an Australian 0.45-caliber submachine gun that entered service during World War II and saw extensive use in the Pacific War, the Korean War, and various postwar conflicts. Renowned for its simple blowback action, robust construction, and unusual top-mounted magazine, the Owen combined elements of earlier designs and field-driven innovation to meet the needs of the Australian Army, Royal Australian Air Force, and Allied units operating in jungle and tropical conditions.
Evelyn Owen began work on the design in 1939 after observing developments in weapons such as the Thompson submachine gun, the MP 40, and the Sten gun. Early trials were conducted with support from the Commonwealth Small Arms Committee and individual officers including personnel connected to General Douglas MacArthur's South West Pacific Area. After demonstrations to representatives from the Australian Military Forces and the Department of Defence, the design was refined at the Lithgow Small Arms Factory under the supervision of engineers who had experience with the SMLE and other service rifles. The top-mounted, gravity-assisted magazine and a recessed bolt with a separate recoil spring guide were distinctive solutions developed to improve feeding and reliability in the mud and humidity encountered during the New Guinea campaign and operations around Borneo.
The Owen used a simple blowback, open-bolt mechanism firing the .45 ACP cartridge, with a cyclic rate around 700–720 rounds per minute similar to contemporaries like the Thompson submachine gun and the M3 submachine gun. The weapon featured a 34-round detachable box magazine mounted on top, allowing for a low bore axis and reliable ejection via a forward ejection path that kept spent cases away from the receiver and shooter—an advantage compared to bottom-ejecting designs like the Sten gun and MP 40. Construction employed a solid steel receiver and stamped components akin to production techniques used at the Royal Small Arms Factory, Enfield and the Springfield Armory, while furniture and buttstocks followed patterns seen on the Lee-Enfield series and other Commonwealth small arms. Sights were fixed iron, offering comparable aiming solutions to the Bren light machine gun and contemporaneous submachine guns.
Adopted rapidly in 1942, the Owen became a primary submachine gun for Australian formations engaged in the New Guinea campaign, jungle patrols during the Kokoda Track campaign, and coastal operations in the Solomon Islands campaign. Units issued the weapon included elements of the Australian Imperial Force, the Papua New Guinea Volunteer Rifles, and special units operating with Allied commands such as those attached to the United States Army Forces in the Far East and Commonwealth commando units influenced by doctrines from the British Commandos and Z Special Unit. Performance in the field earned praise from commanders recalling conditions similar to those in earlier jungle settings like Malaya and later conflicts such as the Korean War, where Australian battalions operating with the British Commonwealth Forces Korea deployed the Owen alongside Sten- and Thompson-armed units.
Several wartime and postwar variants were developed, reflecting needs identified by users and workshops such as those at Lithgow Small Arms Factory, private firms in Sydney, and remanufacture facilities similar to those at the Ordnance Factory. Modified features included changes to the magazine housing and feed lips, simplified stamped-receiver versions inspired by mass-production lessons from the M3 "Grease Gun", and later compact versions used by police and paramilitary formations influenced by designs tested at the Royal Military College, Duntroon. Accessories and field modifications paralleled improvisations seen with the Sten in resistance and guerrilla forces across Europe and the Pacific.
Initial production was carried out at the Lithgow Small Arms Factory with the assistance of contractors in Melbourne and private workshops adapting jigs and tooling similar to wartime practices at the Dominion Arsenal and Evans Deakin & Company. Total wartime and postwar production reached approximately 45,000 units, rivaling production figures for other Commonwealth small arms produced at facilities like the Harrington & Richardson works and the Long Branch Arsenal. Postwar manufacturing and overhaul work were performed at government arsenals with refurbishment programs akin to those executed at the Royal Australian Navy dockyards and civil machine shops in Adelaide.
Primary users included the Australian Army, the Royal Australian Air Force, the Royal Australian Navy for boarding parties, and auxiliary formations such as the Australian Imperial Force infantry battalions, Z Special Unit, and police forces in the Territory of Papua and New Guinea. Allied and proxy users ranged from elements of the United States Army in the Pacific to Commonwealth contingents in Korea and police units in Southeast Asia and the Pacific Islands during decolonization conflicts. Its reliability was frequently contrasted with contemporaries used by Japanese Imperial Army-facing units and later compared to small arms supplied by United Nations Command logistics in Korea.
The Owen's reputation rests on battlefield reliability, straightforward maintenance, and a design philosophy emphasizing ruggedness under harsh environmental conditions found in theaters like the South West Pacific Area and the Southeast Asian theatre of World War II. Its top-mounted magazine and reliable ejection influenced later experimental designs and studies at institutions such as the Australian War Memorial and military research bodies that archived small arms developments alongside icons like the Thompson submachine gun and Sten gun. Collectors, historians, and curators at museums including the Imperial War Museum and the Australian War Memorial preserve examples, and its story intersects with notable personalities and organizations from the wartime Commonwealth industrial mobilization era.
Category:Submachine guns Category:Weapons of Australia