Making BIG GAME PCP 4000 PSI Valve and Tank

In this video I'll be making a valve and a connector for a manometer and a fill nipple for a stainless PCP tank, the maximum pressure is 4000 PSI, but to ensure safety I recommend 3500 PSI. Keep following this series of videos and you'll see the finished version soon, it will be really powerful in just 4,5mm. I am expecting around 1100-1200 fps minimum using a 15.4 grain slug.

Fund my projects: https://buymeacoffee.com/pcpairgunsch...

LATHE used in the video:
MINI Lathe 7x16 800W (Europe and USA link): https://s.click.aliexpress.com/e/_DlY...
Asia link: https://s.click.aliexpress.com/e/_Dlt...

Parts, tools & materials:
25mm brass rod: https://s.click.aliexpress.com/e/_DCF...
27x2mm 304 tube: https://s.click.aliexpress.com/e/_DeT...
pressure gauge: https://s.click.aliexpress.com/e/_Dnm...
fill nipple: https://s.click.aliexpress.com/e/_DDG...
20.3mm O-ring: https://s.click.aliexpress.com/e/_DnS...
HSS mills: https://www.aliexpress.com/item/10050...
drill bits: https://s.click.aliexpress.com/e/_Dm2...
3.9mm drill bit: https://s.click.aliexpress.com/e/_DlZ...
center drills: https://s.click.aliexpress.com/e/_DDa...
m10x1 tap: https://s.click.aliexpress.com/e/_DFN...
m6x1 tap: https://s.click.aliexpress.com/e/_DCJ...
POM rod: https://s.click.aliexpress.com/e/_DBm...
teflon rod: https://s.click.aliexpress.com/e/_DE8...
4mm steel rod: https://s.click.aliexpress.com/e/_De3...
grub screws: https://s.click.aliexpress.com/e/_Ddi...
countersunk screw: https://s.click.aliexpress.com/e/_DCn...
sanding tool: https://s.click.aliexpress.com/e/_DFW...
brass tube: https://s.click.aliexpress.com/e/_DeW...
silicone oil: https://s.click.aliexpress.com/e/_DFY...
10mm thick spring: https://s.click.aliexpress.com/e/_DkM...
7.5mm o ring https://s.click.aliexpress.com/e/_Dml...