Thank you very much for staying to listen to it, it is one of my favorite songs and I put a lot of effort into getting a good sound. The composer of this song is inspired by those western films and songs, even the style of playing the guitar has that intention.
The whistle is essential for the melancholy of the song, as for the sound of revolver it is a percussion instrument called VibraSlap.
Welcome for the comment!~ ^^
Thanks for the information and thanks for sharing the music to the whole wide internet~