Why should you replace your stock screws? Because they rust. After they rust, the become a pain to get apart. S/S does not rust. That is why we have put together this screw kit that includes 6 body screws with nuts, 4 grip screws, 1 velocity adjustment screw, 2 valve screws, 2 bottom line screws, 1 screw with nut for the elbow, and 2 screws for the latch on the elbow. Definitely the best for the buck in paintball.