After my stock Adjustable sight came off in my hand, I decided that I needed a better rear sight, I have never been a huge fan of Adjustable sights so, I started my search and found John's Replacement LPA sight, best decision ever. It was tricky getting the sight fitted which means it should NEVER slide out like the Factory sight did. Additionally, The Harrison Sight edges are not nearly as hostile to your Hand/Side as the Factory sight either. If you are looking for a sturdy, ergonomic fast acquisition replacement sight...Look no further and buy this one, You won't regret it.