I don't know. There's definitely such a thing as ####ing up so badly that they don't deserve a second chance. Given how shoddy this job was I'd be hesitant to let them touch the gun a second time, especially in light of the possibility that parts were changed or heat sensitive parts may have been baked.
Can’t say much about the job but have to give it to the guy on owning his #### up; in my experience with gunsmith mistakes it’s been deny, obfuscate, outright lie in that order