If all you want is a lighter, cleaner trigger, consider buying a replacement spring and then altering it by cutting off a quarter to a half a coil at the time, then replacing it and seeing how it affects the weight of pull. For a cleaner break, carefully polish the face of the sear and the nose of the cocking piece with a hard Arkansas sharpening stone. This method has allowed me to obtain very good results on the 03 and 03-A3 rifle I use for match shooting. Practice of old parts. Possibly consider storing the original parts and using replacement parts for setting the rifle up for match shooting. JMHO. Sincerely. Bruce.