AR-15 front sight alignment

[drnorris]

I have an FN made A2 upper. The front sight assembly is also stock and made by FN. To the best I can tell, this thing has never been disassembled. The front sight assembly is tilted to the left. It is almost impossible to see but the rear A2 sight must be shifted left (windage) to compensate.
What is the best way to straighten this out?
The rifle is very accurate when I do may part.
Thanks
Don

 

[SSGSAD]

I have an FN made A2 upper. The front sight assembly is also stock and made by FN. To the best I can tell, this thing has never been disassembled. The front sight assembly is tilted to the left. It is almost impossible to see but the rear A2 sight must be shifted left (windage) to compensate.
What is the best way to straighten this out?
The rifle is very accurate when I do may part.
Thanks
Don

It just may depend on what exactly, the problem is. Is it cross threaded ? Is it bent ? dunno ????

 

[mvician]

If you are lucky the barrel nut can be loosened, the barrel re-indexed, and the nut tightened back down correctly. Sounds like the nut may have just been over torqued.

If you are not lucky, the front sight base was not installed straight on the barrel.

 

[sloughfoot]

If the front sight base is held on using the tapered pins, a carefully calibrated whack with a plastic hammer to the left of the sight base will straighten things out. Clamp the barrel in a vise first.

Not very high tech, but neither is the mounting method.

If there are 4 set screws, loosen them and turn the sight base. Then retighten.