The contact owns a Nuna Rava Car Seat, Model Type: Convertible, Model Number: CS05013-GRN, Manufactured Date: July 16, 2016. The contact stated that the harness buckle became difficult to adjust while attempting to secure the child in the car seat. The contact received notifications of NHTSA Campaign Numbers: 24C002000 (Child Seat); however, the parts to do the recall repair were not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue.