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**44 AMP** · August 14, 2012, 02:09 PM

As far as I know, the point of the setscrew is to keep the castle nut from coming loose to the point where the sight assembly can be mis-aligned with the bore. While it would be very unusual for the nut to loosen, the setscrew just means insurance.

Usually, the screw will be between the lugs on the nut, and need not be tightened to bear on the nut, (so no tension on the barrel) its just there so the nut can only move a little bit, IF it comes loose.

I might be wrong, and if I am, please, enlighten me.

August 14, 2012, 02:09 PM	#6
44 AMP Staff Join Date: March 11, 2006 Location: Upper US Posts: 28,846	As far as I know, the point of the setscrew is to keep the castle nut from coming loose to the point where the sight assembly can be mis-aligned with the bore. While it would be very unusual for the nut to loosen, the setscrew just means insurance. Usually, the screw will be between the lugs on the nut, and need not be tightened to bear on the nut, (so no tension on the barrel) its just there so the nut can only move a little bit, IF it comes loose. I might be wrong, and if I am, please, enlighten me. __________________ All else being equal (and it almost never is) bigger bullets tend to work better.