According to Larry Vickers, who I interviewed for this book, if you were to pick one component to upgrade consider the Krebs enhanced safety from Circle 10 AK. Priced at around $40, it’s not going to break the bank. Designed by Marc Krebs it allows for manipulation of the safety while maintaining the shooting hand on the pistol grip as well as providing a notch for locking the bolt carrier in the open position. You can get them both for stamped or milled receivers. Don’t leave home without one.