OP - just from what I think I see in the third picture in your original post. There are scuff marks on the chamber area of the barrel, near and around the flutes, that appear to be from a barrel vice. From what I see, what I think is the barrel aligning mark is not "dead centre" with that action screw hole. It may look different in hand. But that seems to me that the barrel has been "screwed on" and may not be "torqued" all the way to alignment. Not real unusual when swapping out a barrel to have had to use a "breeching washer" or to shave the barrel shoulder to get to perfect alignment and headspace. That may cause a headspace issue, so best get headspace checked before shooting it. Further, if that barrel is not perfectly clocked to the receiver, as indicated by the alignment marks on barrel and receiver, then the front sight would not have ended up "straight", using the original grooves for the cross pins that hold that flash hider in place. New grooves would have to have been cut, or that flash hider was epoxied or soldered in place if it is actually sitting "top dead centre" to the receiver flats, if the barrel is not torqued to alignment.