O-Ring Magazine for WE M&P Big Bird. Part n° 78
Front Sight for WE M&P Big Bird. Parts n° 60, 65
Cylinder Valve Sping for WE M&P Big Bird. Part n° 53
Cylinder Valve Base for WE M&P Big Bird. Part n° 51
Magazine Base Plate for WE M&P Big Bird. Part n° 80
Magazine Gasket for WE M&P Big Bird. Part n° 79
Cylinder Valve for WE M&P Big Bird. Part n° 52