Meet the Barbell Bomb by ABMAT: a sleeve that slides onto the end of your barbell to let you try landmine exercises on any surface. It has a high-density foam construction, weighing 4oz. It has a slip resistant design and can be used indoors and outside.
To use this, simply use one on the ground and the other on your barbell. The Barbell Bomb measures 7 inches long. You can find out more about it here.