First date...and I broke her.....

[82Trooper]

So I took my new project to the range today for the first time. Wanted to get acquainted and perhaps zero the girl in. After 60 or so rounds.....this happened.....I cam back to the bench from marking my target and saw the barrel tip looked funny...and found the cracked flash hider about 15 yards downrange. Curiously, it did not make a noticeable noise when it happened.
My questions today are:
1- So what may have caused it? There is a set screw, but is it supposed to be soldered on as well?
2- What is the proper fix? Are they replaceable at home or will it require a professional?

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