Geo: I got that bottle off Ebay or Amazon I didn't see the exact same bottle and regulator set up when I looked today. It was about $70 and good to 4500 PSI. It is made out of cast aluminum and has about a 1/2" wall thickness.
It is about .5 liter cap. This one doesn't have enough capacity to fill to 4500 psi despite be filled to 4500 psi. But it will fill twice to above 3500 psi as long as I don't run the gun down too far.
My compressor has a Temp Gauge on it so it doesn't over heat. I have ran it for 20 minutes on the initial fill of the bottle with no problems and it never got close to shut off heat. The compressor also has an auto shutoff when it reaches the desired PSI.
My Bottle came with the Regulator and Fill Hose. I looked and can't find the exact same complete set up I bought on either Amazon or eBay and the prices are all over the place. There are two psi ratings on the bottles and you have to pay attention if you want the .4500 psi version. I did see the complete set up in the 3000 psi version.
There are also Used Carbon Fibre air tanks for Scott Air Pacs (like firemen use) for around $100 or a little more for ones that are currently certified. They are like 74 CU in.
You'll have to poke around to find the good deals on this stuff cuz all of it is made in China and they don't speak English.
Here's the regulator (pay attention to the threads on it and the tank)
https://www.amazon.com/M18x1-5-Paint...%2C3981&sr=8-8
Here's a bottle
https://www.amazon.com/Gurlleu-Alumi...552715&sr=8-77
The Regulator has a fill port just like the one on your gun, and then uses a fill hose just like the one on you compressor.
You will need to research this a bit as there are a few little nuances and gotchas to avoid. If you can't find the Tank and reg together then you'll have to get them separate, make sure the threads on the tank and reg are the Same.
hope this helps
Randy