Give the gun to an experienced Glock or M&P shooter and have them shoot the gun BEFORE adjusting the sights - 99.9999% of the time it's a shooter with poor fundamentals that causes these guns to shoot low and left. These are some of the least forgiving guns made when it comes to poor fundamental shooting skills, and will almost always throw rounds low and left when a right handed shooter blows it on a shot. When a lefty screws up the rounds go low right - shooting off a bench does not get rid of bad fundamentals, instruction and proper practice do. This may sound harsh, but I've been there, and when I don't pay proper attention to grip, sight alignment, trigger control and follow through, I go right back there - even with 40,000 rounds through my M&P.