Backstrap assembly for a firearm

1. A backstrap assembly comprising:

a monolithic backstrap comprising a top end and a bottom end;

the monolithic backstrap comprising:

a cavity sized to retain a main spring cap, a main spring retainer, a main spring, and a lower end of a strut;

a first opening for a pin, wherein the pin retains the main spring cap, the main spring retainer, and the main spring in the cavity;

a second opening for a thumb safety pin, wherein the second opening is at the top end of the monolithic backstrap;

a first surface configured to abut a grip of a firearm; and

two grooves for slidably coupling the single monolithic backstrap with the grip of the firearm, wherein the two grooves run along the entire length of the first surface from the first end of the monolithic backstrap towards the second end of the single backstrap.

2. The backstrap assembly of claim 1 further comprising a third opening for a coupling pin, wherein the coupling pin prevents the backstrap assembly from slidably decoupling from the firearm.

3. The backstrap assembly of claim 2 wherein the third opening is formed at least partially through the one or more grooves.

4. A firearm comprising:

a frame comprising a grip;

a main spring cap;

a main spring retainer;

a main spring;

a backstrap assembly slidably coupled with the grip, the backstrap assembly comprising a monolithic backstrap comprising a top end and a bottom end;

the monolithic backstrap comprising a cavity, wherein the main spring cap, the main spring retainer, and the main spring are positioned within the cavity;

a pin to retain the main spring cap, the main spring retainer, and the main spring in the cavity; and

an opening at the top end of the monolithic backstrap for a thumb safety pin;

wherein the grip comprises a first surface configured to abut the monolithic backstrap;

wherein the grip comprises two tongues that run along the first surface for slidably coupling the monolithic backstrap with the firearm.

5. The firearm of claim 4 , wherein the backstrap assembly comprises two grooves; wherein the two tongues engage the two grooves to couple the backstrap assembly with the grip.

6. The firearm of claim 5 , wherein the two tongues comprise one or more notches for engaging a coupling pin.

7. The firearm of claim 4 wherein the grip comprises an opening for a coupling pin, wherein the coupling pin prevents the backstrap from slidably decoupling from the firearm.

8. The firearm of claim 7 wherein the opening for the coupling pin is formed at least partially through the two tongues.

9. A firearm comprising:

a frame comprising a grip;

a main spring cap;

a main spring retainer;

a main spring;

a backstrap assembly slidably coupled with the grip, the backstrap assembly comprising a cavity, wherein the main spring cap, the main spring retainer, and the main spring are positioned within the cavity;

a pin to retain the main spring cap, the main spring retainer, and the main spring in the cavity; and

an opening in the backstrap assembly for a thumb safety pin;

wherein the grip comprises a first surface configured to abut the backstrap assembly;

wherein the grip comprises two tongues that run along the first surface for slidably coupling the backstrap assembly with the firearm;

wherein the backstrap assembly comprises two grooves; wherein the two tongues engage the two grooves to couple the backstrap assembly with the grip;

wherein the two tongues comprise one or more notches for engaging a coupling pin.