5.56x30mm MARS
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A cartridge comparison showing major intermediate cartridges, as well as various PDW-type cartridges including Colt's experimental 5.56x30mm MARS (fourth in line), as well as their 9x30mm MARS (second from right).
The 5.56x30mm MARS was a PDW / Assault Rifle cartridge created by Colt during the development of their experimental Colt MARS ("Mini Assault Rifle System") program.
