by 682liny » Mon Jul 02, 2012 10:29 am
I have my new upper,,16 inch bushmaster .450,, sighted in with optics,, OK,,switched over to BUIS, found front sight base/gas block is not square to reciver,, checked set screws,, dimples in barrel are not drilled in right place,, anyone have this problem,, to correct I plan to mill a flat / properly indexed and redrill set screw dimplles,,,any other idias???
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