It is many years ago since I read the selection criteria but I'm pretty sure it was the only compromise acceptable to both the infantry and the cavalry. The infantry refused t have it 'even an inch longer' as it would not be 'manageable' when mounted.
The Infantry conducted tests with various barrel lengths and said the loss of accuracy, if they went any shorter, was not acceptable.
I'll have to rack my brains to try and remember the document.Information
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