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|Place of origin||USA|
|Designer||Melvin M. Johnson|
|Manufacturer||Johnson Guns Inc.|
|Parent case||.30 Carbine|
|Bullet diameter||.224 in (5.7 mm)|
|Neck diameter||.253 in (6.4 mm)|
|Shoulder diameter||.332 in (8.4 mm)|
|Base diameter||.353 in (9.0 mm)|
|Rim diameter||.356 in (9.0 mm)|
|Case length||1.29 in (33 mm)|
|Overall length||1.65 in (42 mm)|
|Primer type||Boxer small rifle|
|Source(s): Barnes & Amber|
Designed by Melvin M. Johnson of Johnson Guns Inc. for their conversion of the M1 carbine, this wildcat was introduced in 1963. It was based on the .30 Carbine, necked-down to .22 (5.7mm) to take a .224 bullet.
- List of cartridges by caliber
- List of rifle cartridges
- 5 mm caliber
- .22 TCM, a similar necked .22 centerfire round
- "Reloading Quick Reference - Reloading". Cheaperthandirt.com. Archived from the original on 2012-03-14. Retrieved 2012-05-22.
- Barnes, Frank C., ed. by John T. Amber. Cartridges of the World (Northfield, IL: DBI Books, 1972), p.127.
- Barnes and Amber, p.127.
- Woodard, W. Todd (2016). Cartridges of the World: A Complete and Illustrated Reference for Over 1500 Cartridges. Gun Digest Books. ISBN 978-1-4402-4648-7.
- Barnes, Frank C., ed. by John T. Amber. "MMJ-5.7mm", in Cartridges of the World, pp. 127 & 143. Northfield, IL: DBI Books, 1972. ISBN 0-695-80326-3.
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