sabotloader, I did a very minimal job of lapping on my Omega Z5 to get rid of some burrs and put a light polish on it so it would clean with out cutting up the patches; I can not believe how much differance it made the Shock Waves fit perfect now and load fairly easy and the Chrushribs I bought about fall down but they won't group so good as the regular I am thinking you have to have a really tight bore to shoot them good unless it just my gun. Lee