Assertion: assault rifle's design | /r/Synonym | the em-1 cobra
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text: The Royal Small Arms Factory (RSAF) at Enfield started working on four designs, of which two generally similar designs known as the EM-1 "Cobra" (designed by Stanley Thorpe) and the EM-2 "Mamba" (the "EM" standing for Experimental Model) came to the fore.