Imo, after the nuts drop from first trip to ray and resize, my ninjas are better than originally, i havent had one resized twice yet, they keep screamin away but i cant see why it wouldnt be even better yet, to the point of the piston gettin worn out around the wrist pin....its bein hand(and a good one!!) refit for the secome time by the same person...i think itd be hard to beat if ur tolerances are good...