These were factory bolts that had never been apart. The shroud is made of cast metal. The threads sheared under recoil. One of the bolt bodies had the threads completely trashed. They didn't shear from some numb nuts with a pipe wrench over tightening them.That's what torque specs are for. I am an engine builder so nothing gets just twisted till the screw driver flies out and stabs the bench. Some of you guys are really something. LOL That bolt is crucial to repeatable accuracy.