Iron sites

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Iron sites

Postby 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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Re: Iron sites

Postby commander faschisto » Mon Jul 02, 2012 1:21 pm

Had the same problem on my 20" barrel with the "faux" front gas block, was off about two degrees to the right. Turns out it was just tightened down off-axis, must have been a Friday afternoon build at Bushy. Loosened it, engaged dimples correctly, tightened back down, and voila...straight up and down! If your dimples are actually mis-drilled, you have the right idea there. Just be sure to corrosion treat any bare metal you create before reassembling.
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