Are we talking ported or compensated barrels or what? I have a G26 with ported barrel and it has zero flip.
If we are talking unported, my vote goes for the HK P7M8. The barrel is fixed inline and the recoil is gas discharge and inline as well. The gun is all metal; no plastic. The weight (it is not that heavy as it is well designed and very thin) also helps reduce muzzle flip. I have shot almost one of everything currently available (or at least over the past couple of years) and the P7M8 is my baby as far as accuracy and flippiness is concerned. I can draw and get off 2+1 shots in a flash as the recoil seems to be more inline and a straight push back into my arm than a 'flip'.
Having said that, I also have a Kimber 9mm Target II in Stainless Steel that seems to do the same thing, but I am sure that it is a byproduct of the weight of the thing. More weight, less flip.
One needs to qualify what kind of 9mm they are referring to when talking about muzzle flip I think. We have ported/compensated barrels reducing flip. We have sheer weight reducing flip and we have quality of design reducing flip.
My P7M8's reduce flip through relative weight distribution and design. They are a treat to carry (stateside) and they are a treat to shoot. Best of all, if I should ever find myself in a position where I am forced to use the gun in self defense, I know it is up to the task in all respects.
I used to be a .45ACP guy. If it wasn't a .45 it wasn't worth the effort to carry. But with today's engineered loads in 9mm. and .357, I have to say that my views have changed significantly. Just don't drive through New Jersey with an "engineered load" as you will find yourself at the wrong end of a felony conviction, no questions asked, do not pass go. That is, of course, assuming that you carry a firearm when in the states.
As one who has endured two home invasions (one successful) and had a gun stuck in his nose in Orlando FLA, I do not travel anywhere that I can legally carry concealed without a means of self protection. And I have committed to travelling at least once a year to one of the self defense schools like Gunsight in order to 're-qualify' myself.