This is the spring ball plunger bullet catch that goes on the left and right sides of the lower step in the aluminum Airstream double step assembly.
Made of stainless steel, it is 5/16 inch diameter 3/8 inch long and goes on the bottom of the Airstream double step.
Airstream part number 380075 to replace original discontinued part number 410201.
#25 on the step diagram.
