This diagram taken from Browning’s instruction e book with the Auto 5 exhibits the bronze friction piece along with the friction ring. (Photo courtesy Browning). The Browning Auto five will however perform reliably without this adjustment, and apparently will essentially operate with no bronze friction piece and friction ring installed https://semi-automatic-nerf-guns85948.iamthewiki.com/8771427/everything_about_ar_9_pistol_8_5_barrel_7_m_lok_rai