Colt MARS

The Colt MARS (mini-assault rifle system) was an experimental, scaled-down variant of the M16 rifle tested by Colt as a personal defense weapon (PDW) around 1997. It was chambered for the experimental 5.56×30mm MARS cartridge which is a shortened 5.56×45mm NATO round. The 5.56×30mm cartridge fired a 55 gr projectile at 790 m/s. The rifle was patented in 1998.