mpower

bought a used hk marked m3 the other day .owner said it was unused and it looked it. im in my 10 day wait period and im concerned about a small issue i saw before it was swept off to the safe for the wait period. front barrel mounted sights are crooked. is this just as simple as loosening the barrel retaining nut and twisting the barrel so they sit proper or did i buy a FU gun? i feel i got a great deal on it but this one issue has me awake at night. i can kind of replicate the issue with my 870 but thats comparing *****s to oranges. can any of you m3 owners give me some insight on the issue?