Our grassfed, American Pride Chuck Arm steak (Swiss steak) is cut from chuck section and should typically be braised and not grilled. While you can soften this cut up with a marinade, this is a steak that should be used for stews or other dishes where it will be cut up before being served.
 
Check out these amazing recipes to prepare Chuck Arm Steak: 
Crock Pot Arm Steak Recipe
How to cook a Boneless Arm Steak or Swiss Steak
Steak and Guiness Pie