Back in the mid 80's at RAF Marham human error using HP gas kit, cost a lad one arm below the elbow & a couple of fingers of his other hand .
Sh*t like that gives you a healthy respect for HP compressed gasses, but you still read threads from people messing with rifle insides, often "helping" their mate ,
and having to ask questions that show a lack of much knowledge about what they're doing.
Makes me cringe .