BB Retaining Ball for later Crosman V350's, Crosman 3500, M1, and Sears 126.102940. Use with spring CRS350-041, sold separately. Also used for the Benjamin 392, 397, 397PA, and other Benjamin/Sheridan models for the safety. This is the mid-sized ball of the 3 different balls 0.140" (9/64) diameter used for retaining BBs in the Crosman V350, M1, and V3500. Use with spring CRS350-041.