ya, this was a blued, 4" model 57. didn't think to inquire about any -1, -2. since i had never heard of a factory ported 57 i thought someone may have done it aftermarket.
nothing against porting, in general, i just don't like it myself. not good on a pistol that may be shot indoors at night, IMO.
i had one of those taurus titanium jobs in .41 mag, with factory porting. man that guy had serious muzzle blast!
i was recommended to Magnaport my ruger 77 .308 to reduce recoil. i just shot it a bunch and got used to it.