Interesting point about porting is that the holes/slots are placed slightly more centrally on the top barrel because the mid-rib prevents optimum placement on the lower barrel. Noise/looks issues aside this has the affect of making the flip characteristics more equal between the two since the flippier top barrel is somewhat more tamed but also the one that needs it more in any case if you know what I mean. I had my old spec 682 done and it makes a definite difference in flip, though not perceptibly in recoil in my opinion. I would happily have the racier slots done to my 682e were it not for the noise issue alone, value wise I doubt it makes an ounce of difference which on a 12 year old gun would hardly be worth worrying about.