. https://www.rifleman.org.uk/Enfield_Rifle_No.6_Australia.html.
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. Historical Firearms - Australia’s Experimental 7.62x51mm Short Magazine…

Lee-Enfield No.4 Mk1(T) Sniper Rifle 
Lee–Metford rifle. The 1944 SLR
These experiments began late in the war; April 1944 was when SAL started work on the first of the line. The British government was apparently interested in a self-loading rifle chambered for the 8mm Mauser cartridge (note that they were using the Czech vz37 machine gun, aka Besa, in 8mm). In response, SAL designed a rifle with a tilting bolt action along the lines of a Bren. It was ready for trials in June of 1944 – a very impressive (or perhaps hopelessly rushed) development time of just 3 months. I have no details of the trials, except a suggestion that the gun was either too heavy or had sacrificed reliability in pursuit of a lighter weight.

Prototype Canadian SLR in 8mm, 1944. Note that the magazine appears to be a ZB-26 type. Source: MilArt photo archives
Specs:
Caliber: 7.92mm
Action: Tilting bolt
Length: 45 inches (115 cm)
Magazine capacity: 10 or 20 rounds
Bayonet: British standard No.5
Sights: Aperture

Testing the first SLR design. Source: MilArt photo archives
The 1945 SLR (EX-1)
After the rejection of the 1944 model of rifle and a nearly year-long delay, the rifle was redesigned in March of 1945, with this second model ready for trials in May 1945 (another remarkable 3-month development period). This model used a bolt with locking lugs at the front (as opposed to the Bren-style with a locking surface at the rear of the bolt) and apparently was significantly lightened as a result – but was also deemed overly complex and fragile when tested in August 1945. Improvements were made, and by December of 1945 the test rifle had run 800 rounds successfully.

Canadian EX1 self-loading rifle in 7.92mm. Source: MilArt photo archives
At this point, the Canadian military began to express interest in the rifle, and the Director of Artillery pushed for further funding of the project. Continuing work reduced the rifle’s weight from 10 pounds to 9 (4.5 to 4 kg) and simplified its mechanism. Another trial prototype was scheduled to be ready for testing in April of 1946, but at this point the program began to be overtaken by the competition elsewhere to develop self-loading rifles. 
The Electrolux-built Charlton conversion.
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