Yes. I unknowingly bought a Bubba build as my first AR. The thing was totally thrown together by an amateur, and not only did the castle nut unscrew during firing, the gun developed catastrophic problems within the first 50 rounds that were apparently the result of someone solving "problems" by not following factory specs, or military doctrine, or whatever term you want to use.
I am adamantly against home building to this day because of crap like this.
EDIT: I want to go into more detail just FYI sake in case there are questions.
As a new shooter, I bought my new toy and of course took it home and finger ****ed it for a few hours, probably with at least a six pack at my disposal. Not being familiar with the weapon, I thought the castle nut was there to disassemble the receiver extension for cleaning. I messed with it enough to know that it was tight enough that I couldn't budge it with my fingers. The next day I took the rifle to the range with no more than three or four boxes of ammo and about four Vietnam era twenty round magazines. Someone had already told me not to load them all the way, so each mag probably got no more than 15 rounds. Within those four mags the rifle locked up tight with the breech closed. I took the rifle to a gunsmith. He got the breech open, and he was the one who looked it over and judged it to be an amateurishly done home build. I forget his reasoning, but I was convinced at the time. During the course of his examination he pointed out that the castle nut was already loose, even though I had found it tight enough to need a tool to budge during my lusting session in the previous days.



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