L4A1 mag on the L1A1 Rifle?

[Peter Laidler]

There were patent issues with the curved, supposedly more reliable UK made L4 magazines and we wouldn't allow Australia or Canada to manuafcture them without royalty payments. This also applied to Australia when she wanted to convert her own Brens to L4 spec (Canada didn't bother!) So as they were already producing the internal parts for the 20 round rifle magazines it was a simple matter to just make the rifle magazine longer.

Nothing more to it than that. Next question...........