The recoils are normally written in cfgRecoils section of the config.
However in the case of the MK19 there is no recoil mentioned, the MK19 inherits from MGun, this also has no recoil values mentioned.
class MGun inherits from MGunCore, which, you guessed it, has no recoils listed.
Finally, MGunCore inherits from class Default, which lists its recoil as, recoil = "Empty";.
From cfgRecoils empty is as you would expect empty, empty[] = {};
It is quite possible that the recoil for some weapons are handled by the game engine and not any config.
Planck