Using square HSS bar to make grooves rifling in a tube, passed 5 times for 20 groove,
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Note: This video is for educational and entertainment purposes only. Do not emulate or copy anything you see in this video.
HSS bar 4mm: https://s.click.aliexpress.com/e/_oDX0aat
Steel tube: https://s.click.aliexpress.com/e/_olmFAPj
LATHE used in the video:
MINI Lathe 7x16 800W (Europe and USA link): https://s.click.aliexpress.com/e/_DlYP5IH
Asia link: https://s.click.aliexpress.com/e/_Dlt9SAt