  In the framework of the QCD effective action the vertices of gluon emission
in interaction of reggeons are studied in the limit of small longitudinal
momenta of the emitted gluon. It is found that the vertices drastically
simplify in this limit so that the gluon becomes emitted from a single reggeon
coupled to the projectile and target via multireggeon vertices. Contribution
from this kinematical region is studied for double and 2x2 elementary
collisions inside the composite projectile and target.
