| CPC E21B 43/117 (2013.01) [E21B 43/1185 (2013.01); E21B 43/119 (2013.01)] | 52 Claims |

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1. A perforating gun system comprising:
a cylindrical housing with a bottom end and a top end;
a prewired loading tube assembly disposed within the cylindrical housing and having a corresponding bottom end and top end;
an upper end fitting having a door for receiving a detonator and securing it into a recess coupled to the top end of the prewired loading tube and the top end of the cylindrical housing;
a lower end fitting coupled to the bottom end of the prewired loading tube and the bottom end of the cylindrical housing;
upper electrical connections coupled to the upper end fitting;
lower electrical connections coupled to the bottom end fitting;
a selective switch coupled to a detonator connector receptacle disposed within the upper end fitting;
a baffle coupled to the bottom end of the cylindrical housing, wherein the loading tube is electrically connected to the baffle; and
a detonator electrically coupled to the selective switch and further disposed within the door of the upped end fitting.
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