Firearm firing system

A firearm firing system, comprising a bolt, a hammer, a trigger, a rear retaining block and a front retaining block, said hammer comprising a side retaining lug located at a top side thereof and a hook located at a bottom side thereof, said trigger having a rod member pivotally connected to a top side thereof, said rear retaining block comprising a hook portion at one lateral side thereof, said front retaining block comprising a protruding portion located at a front side thereof, said hook of said hammer being hooked on said protruding portion of said front retaining block when said trigger is not pressed, said trigger being pressable to move said rod member forward and to further cause disengagement of said hook of said hammer from said protruding portion of said front retaining block for enabling said hammer to strike forward, said bolt being moved back immediately to return said hammer and to force said side retaining lug of said hammer into engagement with said hook portion of said rear retaining block after the striking action of said hammer, and then said bolt being immediately moved forward after engagement between said side retaining lug and said hook portion, said rod member being moved back and said side retaining lug of said hammer being disengaged from said hook portion of said rear retaining block and said hook of said hammer being forced into engagement with said protruding portion of said front retaining block after said trigger is released;

• wherein:
• said rear retaining block further comprises a stub rod located at an opposite lateral side thereof;
• said front retaining block further comprises a top abutment portion;
• the firearm firing system further comprises a main bar having a front end thereof pivotally connected to said rod member, said main bar comprising a retaining portion located at a bottom side of an opposing rear end thereof, said retaining portion having a rear side stopped against said stub rod of said rear retaining block and a front side stopped against said top abutment portion of said front retaining block, said main bar being moved backward to bias said rear retaining block and said front retaining block backward for enabling said side retaining lug of said hammer to be hooked on said hook portion of said rear retaining block when said trigger is pressed to move said rod member forward, said rod member forcing said main bar to bias said rear retaining block and said front retaining block forward when said trigger is released, causing said side retaining lug of said hammer to be disengaged from said hook portion of said rear retaining block and said hammer to move said hook into engagement with said protruding portion of said front retaining block.