My Father-in-law has a beretta 92 that shoots 7 inches low at 25 yards, I have seen him shoot his XD9 so I know he shoots better then that. I have e-mail Beretta about it but haven't heard back yet.

Would it be the barrel or the sights? He bought it used so he doesn't know if it was dropped or anything.

How hard would it be to replace the sights with adjustables?