K277BS (103.3 FM; "Z-Rock") is a translator rebroadcasting the classic rock format of the HD3 subcarrier of Leighton Broadcasting's KZPK.

In 2018, it was announced that K277BS would flip to classic rock as "Z-Rock"; the programming on K277BS would originate from KZPK-HD3.

[3] On March 5, 2018 K277BS flipped to Classic Rock as "Z-Rock" relaying KZPK-HD3.

In 2021, KZPK HD3/K277BS quietly rebranded as "Real Rock Z103" with no change in format.

In 2023, KZPK HD3/K277BS reverted back to its previous "ZRock" branding with no change in format.