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The MARS was a scaled down version of the M16 rifle tested by Colt as a PDW in the 1990s. It was chabered for the expiramental 5.6x30 MARS cartridges.
This was tested along with the SCAMP Machine Pistol. The 5.6 cartridges were 55Gr. and fired at ~2600 fps. Patented in 1998, patent no. #5,827,992.
Pictures & Patent Info. Here:http://www.google.com/patents?vid=USPAT5827992&id=9BIZAAAAEBAJ&printsec=abstract&zoom=4&dq=5,827,992#PPA9,M1
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