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Both No4's and No1's have been manufactured in 7.62 for military and police issue.
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I'm not including the Ishapore 2A and 2A1s in that group. The Indian guns had newly manufactured receivers that used a very high grade steel which were capable of withstanding the pressure of the 7.62 NATO.
Tests with original British and Australian made No. 1 actions resulted in the development of excess headspace within a very few rounds.
The No. 4 rifles were able to withstand a simple conversion to 7.62 NATO as is without the manufacture of new receivers.