Brownells go over the BRN-4, a HGK416 clone... "In this From the Vault episode, Caleb gives a full breakdown of his personal BRN-4 build—a refined HK416-style rifle that started as a Gunfighter Gauntlet project and turned into one of his favorite setups. He covers every component from receiver to suppressor, with detailed commentary on each choice and how it performs in real-world use."