Just finished my first tune and am very pleased with the results. I recently purchased a Gamo Hunter Sport and I was ready to return it after trying it out because of the harsh recoil and twangy noise. I decided to keep it and try tuning it. Bought a GRT trigger and a tune kit from ^*^()(%*^$%^)()(&(. Everything went well and although I dont have a chrony it seems to have more power.Also the recoil is a nice solid sounding thunk, and the gun does not seem to jump like it did before. The hands on process also gives the hobby a new level of enjoyment.