Point-to-Multipoint (PtM) communications were identified by 3GPP as a requirement during the start of 5G. Despite this, it was not until Release 17 that the New Radio (NR) native PtM mode was standardized, named 5G Multicast Broadcast Systems (MBS). Most notably, it added new Network Functions in the 5G Core while fully reutilizing NR physical layer to ease adoption and uptake amongst manufacturers. In this context, the paper provides the design and goals of an MBS validation pilot, fully end-to-end (from 5G Core to Receiver) based on open-source implementation from the 5G-MAG Reference Tools repositories. Moreover, this experiment leverages the programmability of Software-Defined Radio equipment and experimentation framework provided by the European 6G-SANDBOX SNS project, the Trial Network Lifecycle Manager to orchestrate and log the measurements performed.