can you ID this magazine?

[mrclark303]

T48E1?

Interesting thought MrE, but I can't think of a good reason to backwards convert the magazine for a then old trials piece...

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[ActionYobbo]

Help me put these events in chronological order.
The making of the 7.62 SLR and 7.62 bren gun magazines.
From what I have read the bren gun was made to be compatible with the SLR. I also read the Mag bottom was changed from the metric style to what is now the standard inch style to stop the mags from being able to be inserted int the bren gun the wrong way. Then I read that the bren would spit out the mag with the metric style lug so a new bigger lug was designed. So this information brings forth some questions. If the L1A1/C1A1/SLR magazine had the big lug and big base plate from the very start why did the bren not have the same? The way it looks to me is that the modifications for the bren gun were incorporated into the SLR as they developed.
So which came first the SLR version or the L4 version of the magazine?