Multi-material firearm receiver

1. A metallic component of a lower receiver for a firearm, comprising:

a body comprising a plurality of apertures between a first side and a second side opposite the first side, wherein the body is configured to mate with a second component of the lower receiver along the second side and to be detachably affixed to the second component of the lower receiver via the plurality of apertures; and

a ring-shaped protrusion at a first end of the body, the ring-shaped protrusion extending outward from the first side away from the second side and perpendicular to the first side and the second side.

2. The metallic component of claim 1 , wherein the metallic component comprises a first material with a first compressive strength exceeding a second compressive strength of a second material of the second component of the lower receiver.

3. The metallic component of claim 1 , wherein the metallic component comprises a first material with a first shear strength exceeding a second shear strength of a second material of the second component of the lower receiver.

4. The metallic component of claim 1 , wherein the ring-shaped protrusion is configured to mate between a buttstock and an upper receiver of the firearm.

5. The metallic component of claim 1 , wherein individual ones of the plurality of apertures comprise respective threads and the body is configured to mate with the second component of the lower receiver by individual inserting a plurality of screws through a plurality of second apertures in the second component of the lower receiver and secured into the respective threads.

6. The metallic component of claim 1 , wherein the body is configured to mate with the second component of the lower receiver by individual inserting a plurality of screws through a respective one the plurality of apertures and into the second component of the lower receiver.

7. The metallic component of claim 1 , wherein the body is configured to mate with the second component of the lower receiver by individual inserting a plurality of pins through a respective one the plurality of apertures and into the second component of the lower receiver.

8. A method, comprising:

positioning a second side of a body of a metallic component of a lower receiver against a second component of the lower receiver;

inserting a plurality of fasteners to secure the metallic component with the second component, wherein the plurality of fasteners at least partially pass into a plurality of apertures between a first side of the metallic component and the second side of the metallic component, wherein the first side is opposite the second side; and

affixing a buttstock onto a ring-shaped protrusion at a first end of the body of the metallic component.

9. The method of claim 8 , wherein inserting the plurality of fasteners comprises individually inserting a plurality pins through the second component and into a respective one of the plurality of apertures in the metallic component.

10. The method of claim 8 , wherein inserting the plurality of fasteners comprises:

inserting a plurality of screws through the second component; and

individually screwing each of the plurality of screws into a respective one of the plurality of apertures in the metallic component.

11. The method of claim 8 , further comprising printing, via a three-dimensional printer, at least a portion of the second component of the lower receiver.

12. The method of claim 8 , wherein the metallic component comprises a lesser volume than the second component, and the metallic component comprises a greater weight than the second component.

13. The method of claim 8 , further comprising affixing an upper receiver against the ring-shaped protrusion opposite the buttstock.

14. The method of claim 8 , wherein the buttstock comprises a buffer tube and a spring.

15. The method of claim 8 , further comprising shipping the metallic component to a user for assembly by the user.

16. The method of claim 8 , further comprising injecting a plastic material into a mold to form the second component.

17. A system, comprising:

a metallic component of a lower receiver of a firearm comprising:

a body comprising a plurality of apertures between a first side and a second side opposite the first side; and

a ring-shaped protrusion at a first end of the body, the ring-shaped protrusion extending outward from the first side away from the second side and perpendicular to the first side and the second side; and

a plurality of fasteners configured to individually be at least partially inserted into a respective one of the plurality of apertures, wherein the body of the metallic component is configured to be affixed with a second component of the lower receiver via the plurality of fasteners.

18. The system of claim 17 , wherein the metallic component is configured to dissipate a kickback force received by the lower receiver in response to a projectile being launched from the firearm.

19. The system of claim 17 , wherein the metallic component is configured to couple with an upper receiver along the first side of the body.

20. The system of claim 17 , further comprising an end plate positioned against the ring shaped protrusion and configured to:

be secured to the ring shaped protrusion by a castle nut and a buffer tube; and

secure the plurality of fasteners in the plurality of apertures to affix the body of the metallic component to the second component of the lower receiver when the end plate is secured to the ring shaped protrusion.