"Mentolio"My understanding of (real) spring gun tuning involves disassembly and cleaning, propper (typically light) lube with thick grease on the spring. Also often involves smoothing/polishing the spring ends to allow them to rotate more freely. The cocking and shot cycle should smooth out, and the buzziness (what I refer to as "rattle-twang") should calm down significantly. Tuning kits like the Vortek often include a new spring, and/or a different top hat and spring guide (I believe Vortek uses delrin material for those bits), that are designed to reduce the spring rotational torque, sloppy clearance between spring and piston, as well as "spring wrap." It's funny, I only own low-end guns, and when I tune them they improve significantly. I've seen others say that their hi-end guns also benefit from a tune. Makes me wonder how hard it could really be to build a gun that is "tuned" out of the box? Typically, a gun in need of a tune is usually a lubrication issue (sometimes a lack of, so times an over abundance of). Just know that often the price of a smooth, quiet springer is a slight loss of velocity.