Firearm fire control group

A fire control group system for a firearm, comprising:

• a trigger having a trigger base, a trigger extension extending from the trigger base, and an over-travel member coupled to the trigger base at a front end thereof, the trigger base having a sear hook extending therefrom and defining a recess and a transverse bore intersecting the recess, the over-travel member having a contact surface and being moveable relative to the trigger base such that a distance in a vertical direction between the contact surface and the trigger base is adjustable;
• a disconnector having a disconnector body and a sear hook extending from the disconnector body, the disconnector body defining a transverse bore extending therethrough and being configured to be received within the recess of the trigger base so that the transverse bores of the trigger base and disconnector align;
• and
• a hammer having a spring spool and a hammer body extending from the spring spool, the spring spool defining a transverse bore extending therethrough, the hammer body having a strike face and a sear extending from an end of the hammer body, the sear being configured to engage the sear hooks of the trigger and disconnector when coupled to a receiver of a firearm.