Firearm trigger assembly
A firearm trigger assembly is disclosed. The disclosed assembly may include a trigger, a disconnect, and a hammer, each of which may be configured to be spring loaded when installed in a firearm receiver. Installation of the trigger assembly in a firearm receiver may include pivotally coupling the trigger and disconnect to the firearm receiver using a trigger pivot pin, and pivotally coupling the hammer to the firearm receiver using a hammer pivot pin. The trigger may include an integral sear feature configured to provide a mechanical stop to the hammer. The disconnect may be configured to be at least partially located in a disconnect slot located alongside or adjacent to the trigger sear feature when the disconnect is pivotally coupled to the trigger. The disconnect and hammer may each include integral cam features configured to buffer hammer contact during firearm recoil.
1. A firearm trigger assembly comprising:
a trigger including an integral trigger sear feature, wherein the trigger is configured to be pivotally coupled to a firearm receiver using a trigger pivot pin and wherein the trigger includes a disconnect slot alongside the trigger sear feature;
a disconnect including an integral disconnect cam, wherein the disconnect is configured to be pivotally coupled to the trigger and wherein the disconnect is at least partially located in the disconnect slot when pivotally coupled to the trigger; and
a hammer including an integral hammer sear feature and an integral hammer cam, wherein the hammer is configured to be pivotally coupled to the receiver using a hammer pivot pin;
wherein the hammer has a center of percussion and wherein the hammer cam contacts a body portion of the disconnect approximate to the center of percussion of the hammer during firearm recoil.
2. The assembly of claim 1 , wherein the hammer cam contacts the disconnect cam during firearm recoil to buffer the impact between the hammer and the disconnect.
3. The assembly of claim 1 , wherein the disconnect slot is alongside only one side of the trigger sear.
4. The assembly of claim 1 , wherein the disconnect cam provides a variable resistance to hammer rotation during firearm recoil, the variable resistance having a low initial resistance and increasing with continued rotation of the hammer.
5. The assembly of claim 1 , further comprising a disconnect spring configured to be positioned between the disconnect and hammer, wherein the disconnect spring is in compression when the disconnect and hammer are pivotally coupled.
6. The assembly of claim 5 , wherein the disconnect includes a stop surface configured to prevent over-rotation of the disconnect during firearm recoil.
7. The assembly of claim 1 , further comprising:
a trigger spring configured to be in compression and apply torque to the trigger when the trigger is pivotally coupled to the receiver; and
a hammer spring configured to be in compression and apply torque to the hammer when the hammer is pivotally coupled to the receiver.
8. The assembly of claim 1 , wherein the trigger pivot pin and hammer pivot pin are both selected from M16 rifle trigger pivot pins.
9. The assembly of claim 1 , further comprising a hammer pivot pin retainer configured to non-permanently retain the hammer pivot pin in the hammer, wherein the hammer pin retainer is further configured to be inserted into the hammer in a direction substantially parallel to a major axis of the hammer pivot pin.
10. The assembly of claim 1 , wherein the trigger sear feature is configured to provide a mechanical stop to the hammer sear feature when the hammer is in a ready-to-fire position and thereby prevent rotation of the hammer in a firing direction.
11. The assembly of claim 1 , wherein the firearm trigger assembly is a two-stage trigger mechanism.
12. The assembly of claim 1 , wherein the trigger is configured to have a pull weight between 0.91 kg (2 pounds) and 2.49 kg (5.5 pounds) when pivotally coupled to the receiver.
13. A firearm including the trigger assembly of claim 1 .
14. A firearm trigger assembly comprising:
a trigger configured to be pivotally coupled to a firearm receiver using a trigger pivot pin;
a disconnect including an integral disconnect cam, wherein the disconnect is configured to be pivotally coupled to the trigger; and
a hammer including an integral hammer cam, wherein the hammer is configured to be pivotally coupled to the receiver using a hammer pivot pin;
wherein the disconnect cam provides a variable resistance to hammer rotation during firearm recoil, the variable resistance having a low initial resistance and increasing with continued rotation of the hammer.