So I'm not sure if his vids will survive the youtube purge but thought these would be of interest
https://youtu.be/SGMTEOcCyZw
skip to 33 min if you want to just see the test. He seems to get more out of it than his professionally made airbow.
He's also found some chinese air equipment for PCPs. A 4500 PSI hand pump for 40 US dollars and a compressor for about 200 US
https://youtu.be/opk7cjPljHg
https://youtu.be/7NdnItyJs-U
The first is just really cool. The second part is very interesting. If the equipment buy in for PCP drops from 200 for the pump down to 40 bucks, that's a game changer. Push a lot of people off the fence.