PCP bottle for Paintball?

[XEMON]

Found those cheap bottle under 2" OD.

3K wihout reg (~$35-40)

https://www.ebay.com/itm/184326245831

4.5K with reg~$50-55)

https://www.ebay.com/itm/184374564000

the 4.5K seems a little high ...
the 3K is about 23ci, but the 4.5K is about 33ci. This would be perfect for pump/light semi. And no hydro (less than 2") is awesome.

Are those usable/fillable at fields?
Any first hand experience?
I don't see DOT stamp on them ...

Thanks
X

[grendal50]

I'd be interested, I'm not sure I trust an aluminum 4.5k bottle though.

[Axel]

It's shipping from China so I'd assume it is not DOT certified