Colt 5.56 MARS


I need information on the Colt 5.56 MARS Experimental. The headstamp is “R . P 223 REM”. What does MARS stand for? Bullet weight? Who made it? Weapons system?


Mini Assault Rifle System

Google is your friend. ;)


Ray–Thanks for the answer to what MARS stands for. I did not expect an answer so quickly on the holiday weekend.

I thought that the IAA Forum was Google for ammunition!!!


Check IAA bulletins 393, 408, 415 and 423. You will find information about 9 mm and 10 mm cartridges too.

You may be interested in this two patents: