BigJ12 said it all. If your bows tuned you shouldn't have any trouble. I was shooting Spitfire's and had them grouping pretty good but bought some T-heads and Muzzy 4 blades and they didn't fly right. Made some adjustments and got both the fixed and the mechs flying true. The Muzzy's group pretty good but don't seem quite as tight as the Spitfires and T-heads.