It is good to go, but for me I go a little farther on all my guns, so my new 66 is at the Gunsmith right now, geting new springs and a chamfer on the barrel muzzel, he said it all looks great and the tune up will just make better, my muzzlel has a 11 degree crown, but the bore had a wire edge that can spoil the accuracy of a gun, so a 45 degree chamfer witll take care of that, and being a short barrel, 3" revolver with a .008 cylinder to forcing cone gap, I want everything I can do to make this gun accurate as possible...