The reason I ask, is that my issue G17 formally belonged to the Departments firearms instructor. He's had it for years and fired who knows how many rounds through it. I've been firing about 50 rounds a week for 3 years myself. It functions flawlessly but has poor accuracy. By that I mean from a sandbag rest at 15 yards, it groups around 4 to 5 inches. So. Can they be worn out to the point of inaccuracy?