as desired may be used the hanger running tool 28 in use applies pressure force to the full bore production system 1 via a chamber 35 and hydraulic fluid communicated through the pressure port 32 in the bop adapter 34 in use a downhole completion is initiated by drilling and completing an oil or gas production well in such a manner that the well can allow proper flow during the period in which the reservoir operates the full bore production system 1 may be used for completing the well with the tubing hanger system 5 installed to allow communication and control of downhole functions and as a sealing mechanism for the production components that are utilized in the operation of the well the tubing hanger system 5 is positioned and installed by utilizing the hanger running tool 28 to insure proper placement and to keep the tubing and control lines from becoming entangled in the system the hanger system 5 includes the upper lock ring mechanism 36 the upper and lower load sleeves 38 40 the outer loading sleeve 37 a stud force pin 16 and the load segment 14 mechanism these elements provide the means for running setting locking and preloading the load segment 14 mechanism without requiring the use of a permanent stop shoulder in the wellhead 4 this method will also limit the possibility of leakage in the system tubing due to the fact that the load segment mechanism can be run with the tubing hanger system 5 in a single approach u2014 thus limiting the opportunities for potential leakage upon its removal it should be noted that as shown in fig1 and 1a the full bore production.