They had to file it to get it off, that's how short the rear is now, and crazy loctited it was.
You are basically calling the new shop a pile of **** for cleaning up someone else's pile of ****. So yeah, maybe let that go?
You haven't been shy about naming names up until now, what's stopping you now?
Here's a suggestion:
Modify the least expensive part - the wrench.
25 seconds on the bench grinder, quenched twice and touched up on the belt sander.
Otherwise, I'd have applied a little heat to release the Loctite before going at your $450 muzzle brake with a file. Even then, I'd have set it up on the mill and cut longer flats.
But hey, that's just me.