
The M1C1 is a modified M1 (or M1A1 or M1A2) Abrams main battle tank platform. It contains nine unique improvements:
1. The 105mm M1 Cannon is replaced with the 20mm GAU-4 (or 30mm GAU-8) Cannon
2. The two M1 tank treads are replaced with four half tracks
3. The 4 man M1 tank crew is downsized to a 3 man M1C1 crew
4. Ammunition storage for 105mm shells is replaced by the integrated GAU-4
5. Two long-range anti-tank missiles (e.g. TOW, HellFire, etc.) are added to the M1C1
6. Two powerful external intercoms are added to communicate with nearby infantry
7. An incoming projectile detection system for locating enemy small arms fire is added
8. An electrically deployable, 387 inch long full body ghilli camouflage system is added
9. Infrared and laser jamming modules are added; laser detection units are added
The M1C1 is designed to be an A-10 infantry support fighter on the ground.
Don't see the reason for "The two M1 tank treads are replaced with four half tracks." Otherwise, kind of a neat idea...