Lets see some pictures of the rifle.
Are we speaking of a standard front sight housing (A-Post)?
If so it could be very possible PSA has the Index Pin on the Barrel Extension and the Front Sight Housing completely out of alignment. Usually caused by misdrilling when installing the Front Sight Housing (A-Post). I am saying this because you said you had the BUIS Rear Sight on another rifle and it was OK. So pictures might help. If it is out of alignment being a new barrel they would get it back. When this happens with standard sights usually the Rear Sight Aperture is adjusted clear over against the side of the Rear Sight Aperture Housing and you still do not have enough adjustment to correct the windage for a center target hit.
So give us some pictures on the front and rear sight in relationship with the barrel.
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Last edited by Sniper03; 07-07-2015 at 03:48 PM.