I’m talking about what looks like a 4 or 4 1/2” surface grinders making a ton of sparks with a camera angle to make it dramatic.
Of course they are not going to make it an educational documentary showing how to restore a welded side plate on a de-milled M-2, they very briefly mentioned that though.
The most radical I have ever gotten was a Dremel to a feed ramp on my 1911 barrel.
Ya. I got radical and used a Dremel to put a 11* recessed target crown on my Mini barrel. I dressed a grind stone to
match the profile and it worked out real nice.
Before that I had it cut and threaded 12-28 for AR compensators. That was done by a gunsmith. he silver soldered an M14 style sight on and a machinist friend made me a long M14 style flash hider, so now it looks much like a real M14.