Adjustable modular trigger assembly for firearms

In a semiautomatic rifle of the type having a modular trigger assembly removably mounted between the sidewalls of a receiver by a trigger pin and a hammer pin inserted through respective pivot bushings, extending through the modular trigger assembly, with the inserted hammer pin and trigger pin being supported within aligned holes in the receiver sidewalls, the improvement comprising:

• a. the modular trigger assembly comprises a modular trigger housing containing all the trigger components of the rifle, wherein the trigger components comprise:
• i. a primary trigger rotatably mounted on a stationary first pivot bushing, between two sidewalls of the modular trigger housing, whereby the primary trigger can pivot about the stationary first pivot bushing and the trigger pin, which extends through the first pivot bushing;
• ii. the primary trigger has an elongated central slot in a trigger blade of the primary trigger;
• iii. a secondary trigger rotatably mounted, on a trigger blade pin, within the elongated central slot, whereby a trigger blade of the secondary trigger can pivot about the trigger blade pin and within the slot;
• and
• iv. a hammer rotatably mounted on a second stationary pivot bushing, between the two sidewalls of the modular trigger housing, whereby the hammer can pivot about both the stationary second pivot bushing and the hammer pin, which extends through the second pivot bushing;
• b. a trigger force adjustment means, contained in the modular trigger housing, for adjusting an amount of force required to rotate the primary trigger, wherein the trigger force adjustment means comprises a set screw and a trigger force adjustment spring housed in a first throughbore of the modular trigger housing, the first throughbore being at least partially threaded;
• and
• c. a sear adjustment means, within the modular trigger housing, for presetting the amount of force at a manufacturer, wherein the sear adjustment means comprises a sear adjustment screw, a sear spring and a sear follower housed in a a second throughbore of the modular trigger housing, the second throughbore being at least partially threaded.

In a semiautomatic rifle of the type having a modular trigger assembly removably mounted between two sidewalls of a receiver by a trigger pin and a hammer pin inserted through respective stationary pivot bushings, extending through the modular trigger housing, with the inserted hammer pin and trigger pin being supported within aligned holes in the receiver sidewalls, the improvement comprising:

• a. the modular trigger assembly comprises a modular trigger housing containing all trigger group components of the rifle, wherein the trigger group components comprise:
• i. a trigger rotatably mounted on a first stationary pivot bushing, between two sidewalls of the modular trigger housing, whereby the trigger can pivot about the first stationary pivot bushing and the trigger pin, which extends through the first stationary pivot bushing;
• and
• ii. a hammer rotatably mounted on a second stationary pivot bushing, between the two sidewalls of the modular trigger housing, whereby the hammer can pivot about the hammer pin, which extends through the second stationary pivot bushing;
• b. a sear adjustment means, housed in a first throughbore of the modular trigger housing, for presetting a force required to rotate the trigger, the first throughbore being at least partially threaded;
• and
• c. a trigger force adjustment means, within the modular trigger housing, for adjusting the force required to rotate the trigger, wherein the trigger force adjustment means comprises a set screw and a trigger force adjustment spring housed in a second throughbore of the modular trigger housing, the second throughbore being at least partially threaded.