::.22 Spitfire


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The .22 Spitfire (also known as 5.7mm Johnson or MMJ 5.7mm Johnson<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>) is an American rifle cartridge.

Designed by Melvin M. Johnson of Johnson Guns Inc. for their conversion of the M1 carbine,<ref>Barnes, Frank C., ed. by John T. Amber. Cartridges of the World (Northfield, IL: DBI Books, 1972), p.127.</ref> this wildcat<ref>Barnes and Amber, p.127.</ref> was introduced in 1963. It was based on the .30 carbine, necked-down to .22 (5.7mm).<ref name="Barnes and Amber, p.127">Barnes and Amber, p.127.</ref>

It is suitable for rabbits, coyotes, or other varmints,<ref name="Barnes and Amber, p.127"/> and has potential as a military round.<ref name="Barnes and Amber, p.127"/>

.22 Spitfire sections
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