Stock FNX9 Accuracy Issue?

[Aufdrahtsein]

My friend recently purchased an FNX9 and he asked me to pose the question on here as to what would cause a stock pistol to have accuracy issues right out of the box; he's an avid shooter with good form, and even when he's trying to engage targets close up and aiming right down the sights, he states that the gun is shooting low --- any one else experience similar issues and what the cause could be?