Trigger group module for firearms and method for installing a trigger group in a firearm

A trigger group module for a firearm, the trigger group module including:

• (a) a module housing adapted to be inserted to an operating position in a firearm;
• (b) a first pin receiver positioned in the module housing;
• (c) a first temporary pin supported on the module housing in a first component supporting position, the first temporary pin having a first end supported at a first side of the first pin receiver and a second end supported at a second side of the first pin receiver;
• and
• (d) a right side membrane adhered to an outer surface of the module housing so as to fully or partially cover the first side of the pin receiver and a left side membrane adhered to an outer surface of the module housing so as to fully or partially cover the second side of the pin receiver.

A method of installing a trigger group in a firearm, the method including the steps of:

• (a) inserting a trigger group module into a trigger group receiving area of a firearm;
• (b) aligning a first temporary pin supported on the module with a first pin receptacle of the firearm;
• (c) inserting a first permanent pin through one side of the first pin receptacle to displace the temporary pin from the trigger group module;
• and
• (d) positioning the first permanent pin in the first pin receptacle so that the first permanent pin is supported at a first end thereof by a first bearing surface of the first pin receptacle and is supported at a second end thereof by a second bearing surface of the first pin receptacle.

A method of installing a trigger group in a firearm, the method including the steps of:

• (a) inserting a trigger group module into a trigger group receiving area of a firearm;
• (b) aligning a first pin receiver on the trigger group module with a hammer pin receptacle of the firearm;
• (c) supporting a hammer component of the trigger group module from bearing surfaces of the hammer pin receptacle by inserting a first permanent pin through one side of the hammer pin receptacle to displace a temporary hammer pin from the trigger group module;
• (d) aligning a second pin receiver on the trigger group module with a trigger pin receptacle of the firearm;
• and
• (e) supporting a trigger component of the trigger group module from bearing surfaces of the trigger pin receptacle by inserting a second permanent pin through one side of the trigger pin receptacle to displace a temporary trigger pin from the trigger group module.

A trigger group module for a firearm, the firearm including a portion defining a trigger group receiving area for containing one or more trigger group components, the trigger group module including:

• (a) a module housing adapted to be inserted to an operating position in the trigger group receiving area;
• (b) a first pin receiver positioned in the module housing so as to align with first pin receptacle openings of the firearm when the module housing is in the operating position, the first pin receptacle openings defining pin support surfaces formed in the portion of the firearm defining the trigger group receiving area;
• (c) a first module pin received in the first pin receiver;
• (d) a pivoting trigger group component mounted on the module housing for rotation about the first module pin;
• (e) an overtravel feature extending from an upper surface of a bottom wall of the module housing in a forward part of the module housing;
• and
• (f) a take-up feature extending from an upper surface of the bottom wall of the module housing in a rear part of the module housing.