I busted a shotgun including a fixed choke shotgun barrel...during some private lessons, once upon a time.
Now the set up was "Survive" and the shotgun was loaded for me, and so was my pistol.
Just how Mentors did things.
One tends to "get into it" as far as Mindset, and I was into "it".
Targets were steel plates and I had to get from where I was to safety...
Mentors had a tendency to load dummy rounds, by the way, and even dummies for spare shells, or in speed strips, speed loaders or magazines.
Just I was not given any spare shells or ammo for handgun.
Steel plate was between me and safety and I was out of ammo and I never heard Mentors yelling "NO!"
My brain was in survival mode screaming;
Take an action...
Do something...
Keep moving...
Don't Quit...
Run what you brung...
I made it to safety...
The barrel had to be cut from 28" to 25" best recall.
New forearm, and buttstock fixed up the gun.
Stuck a new barrel on this gun, and later a external screw in choke was installed in the barrel I split.
Lessons coming up, and that steel plate was not a steel plate to me, instead evil that I had to do something about to get safe.
I busted up a 1911 , and Model 10 doing similar things in lessons.
Just a friggin' tool...and no tool is ever any better than the user of said tool.