Welcome to the forum. The Gp serier benefit from a little dressing to certain parts that can be done easily in one evening in your living room. They also smooth out considerably from dry firing. You can't hurt them. One of our member, Iowegan, has been gracious enough to put his expertise as a gunsmith into an e-book with many helpful hints. The IBOK is free just by emailing him and requesting it. Put the GP100 IBOK as subject.