basement framing with metal Studs Best way to fasten them to the floor
The U-shaped metal track that goes along the concrete floor to hold the studs is typically fastened to the floor with the short concrete nails put in place with the ramset method. The vertical metal studs are then put in place and they are attached to the up turned sides of the metal track using sheet metal screws. The screws most often used are ones that self pierce the metal and thread themselves in to secure the studs. 

Note that the metal track and the metal studs are rather thin and offer little or no resistance to the placement of the ramset concrete nails.