AR Sponsor
Posted: 11/28/2008 5:05:36 PM EDT
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Anyone else have this problem with the FSB? Is this a common issue with the AR or CMMG?
I just received my Troy BUIS and once I mounted it, seems like the FSB is canted... I'm assuming it's not the Troy BUIS. |
| check that tee rear sight is not leaning, which would indicate a rail out of spec, or the sight itself is out of spec. I had a Bushmaster upper once that was not machines to the right dimensions, and any and all rear sights would lean causing a need for excessive windage adjustments. Those rear sights checked out normal on other uppers. |
| I have had this problem on FF rail front ends... especially the ones from MI - nothing against their product - but they time off of the barrel nut and any small burrs will cant the rail and correspondingly the front sight. can drive you nuts. They make a tool too time the rail to the upper flat top but I use a detach carry handle with decent success. |
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