I have a Crossman 600 CO2 pellet pistol from the early 1960s. In college, I brought it to show my ROTC Marksmanship instructor.
He somehow loaded the CO2 cylinder wrong and it jammed in the tube under the barrel. He used a pair of pliers it free it.
When it broke free, it shot around the range like a rocket! Banging off desks and walls and breaking a light fixture. We all ducked under desks to avoid the missile.
Luckily, no one was hurt and we all got a nervous laugh out of it. But the pistol was not invited back.
Check out Randy here with the civil war wound from the valve of a CO2/PCP conversion. (At 4:15, GRAPHIC)
https://m.youtube.com/watch?v=a1hrms0i2LU
He had that thing pulled out under a local and had the doc bring a mirror in so he could watch!
I’ll be shooting against him on their home turf at OR state championship :-)