"...No. 1 bubbas..." Yep. More of 'em made. A lot of bubba'd No. 1's have bad headspace too. So do bubba'd No. 4's.
"...India produced them..." Yep. In the mid 60's, but not converted No. 1's. Completely new rifles chambered in .308/7.62. Called a No. 2A Mk III.
Australia didn't switch to the No. 4. Used their No. 1's until they adopted the FAL.

The thicker barrel on the No. 4 makes it more resistant to an indiscriminate hack-sawing(!)
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