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A modular buttstock assembly that removably mounts to a receiver extension of a firearm may include a main body and a rear body. The main body may have a passage that mates with the receiver extension, while the rear body may be removably coupled to the main body such that any number of swappable, m

A modular buttstock assembly that removably mounts to a receiver extension of a firearm may include a main body and a rear body. The main body may have a passage that mates with the receiver extension, while the rear body may be removably coupled to the main body such that any number of swappable, modular rear bodies may be coupled to the main body. The main body may include a toggle assembly with a actuating lever coupled to an bowed or ached actuating spring. The toggle assembly may also include a locking block with a plurality of shafts that distribute the load from the receiver extension to the main body rather than concentrating mechanical stress on a single lock pin.

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1. A modular buttstock assembly that removably mounts to a receiver extension of a firearm, the modular buttstock assembly comprising: a main body comprising: a passage that mates with the receiver extension of the firearm, anda toggle assembly comprising: an actuating spring having a biased positio

1. A modular buttstock assembly that removably mounts to a receiver extension of a firearm, the modular buttstock assembly comprising: a main body comprising: a passage that mates with the receiver extension of the firearm, anda toggle assembly comprising: an actuating spring having a biased position and an unbiased position, anda locking block coupled to the actuating spring; anda rear body removably coupled to the main body, wherein no part of the toggle assembly is disposed within the rear body. 2. The modular buttstock assembly of claim 1, wherein an entirety of the toggle assembly remains coupled to the main body when the rear body is uncoupled from the main body. 3. The modular buttstock assembly of claim 1, wherein the toggle assembly is disposed within the main body. 4. The modular buttstock assembly of claim 1, wherein the actuating spring is a bowed actuating spring. 5. The modular buttstock assembly of claim 4, wherein the bowed actuating spring is made at least partially of a polymer. 6. The modular buttstock assembly of claim 1, wherein the locking block includes a first disposed between a plurality of side shafts. 7. The modular buttstock assembly of claim 6, wherein each of the plurality of shafts is abuttedly engaged with the receiver extension of the firearm when the actuating spring is in the biased position. 8. The modular buttstock assembly of claim 6, wherein none of the plurality of shafts is engaged with the receiver extension of the firearm when the actuating spring is in the unbiased position. 9. The modular buttstock assembly of claim 6, wherein the first shaft is a locking plunger and the plurality of side shafts include a plurality of flat surfaces. 10. The modular buttstock assembly of claim 9, wherein the locking plunger is abuttedly engaged with the receiver extension of the firearm at a void disposed in the receiver extension and the plurality of side shafts are each abuttedly engaged against a flat outer surface of a non-cylindrical portion of the receiver extension when the actuating spring is in the biased position. 11. The modular buttstock assembly of claim 9, wherein the locking plunger and the side shafts are not abuttedly engaged with the receiver extension of the firearm when the actuating spring is in the unbiased position. 12. The modular buttstock assembly of claim 9, wherein the locking plunger and the plurality of side flanges are constructed as a single collective component. 13. The modular buttstock assembly of claim 1, wherein the rear body includes a buttpad. 14. The modular buttstock assembly of claim 1, wherein the rear body includes a sling mounting point. 15. The modular buttstock assembly of claim 1, wherein the rear body includes a storage compartment. 16. The modular buttstock assembly of claim 15, wherein the storage compartment is accessible by a hinged panel disposed at a rear surface of the rear body. 17. The modular buttstock assembly of claim 16, wherein the hinged panel includes at least a portion of a buttpad. 18. The modular buttstock assembly of claim 16, wherein the hinged panel is retained in a closed position by a pin removably coupled to the main body. 19. A modular buttstock assembly that removably mounts to a receiver extension of a firearm, the modular buttstock assembly comprising: a main body comprising: a passage that mates with the receiver extension of the firearm, anda toggle assembly comprising: a bowed actuating spring having a biased position and an unbiased position,a locking block coupled to the actuating spring, andan actuating lever abuttedly engaged with the actuating spring when the actuating spring is in the unbiased position; anda rear body removably coupled to the main body. 20. The modular buttstock assembly of claim 1, wherein the passage of the main body mates with a non-cylindrical portion of the receiver extension. 21. The modular buttstock assembly of claim 19, wherein the passage of the main body mates with the receiver extension of the firearm when a portion of the receiver extension is non-cylindrical. 22. The modular buttstock assembly of claim 19, wherein the actuating lever is substantially flat and free of protrusions with respect to the main body. 23. The modular buttstock assembly of claim 19, wherein the locking block includes a first shaft disposed between a plurality of side shafts, and wherein the first shaft is abuttedly engaged with the receiver extension of the firearm at a void disposed in the receiver extension and the plurality of side shafts are each abuttedly engaged against a flat outer surface of a non-cylindrical portion of the receiver extension when the actuating spring is in the biased position. 24. A modular buttstock assembly that removably mounts to a receiver extension of a firearm, the modular buttstock assembly comprising: a main body comprising: a passage that mates with the receiver extension of the firearm, anda toggle assembly comprising: a bowed actuating spring having a biased position and an unbiased position, anda locking block coupled to the bowed actuating spring and abuttedly engaged with a void disposed in the receiver extension of the firearm when the bowed actuating spring is in the biased position, wherein the bowed actuating spring pivots the locking block out of engagement with the receiver extension of the firearm when the bowed actuating spring is moved into the unbiased position; anda rear body removably coupled to the main body. 25. The modular buttstock assembly of claim 24, wherein the bowed actuating spring pivots the locking block along an axis perpendicular to a longitudinal axis of the passage of the main body. 26. The modular buttstock assembly of claim 24, wherein the locking block includes a first shaft disposed between a plurality of side shafts. 27. The modular buttstock assembly of claim 26, wherein the first shaft is abuttedly engaged with the receiver extension of the firearm at a void disposed in the receiver extension and the plurality of side shafts are each abuttedly engaged against a flat outer surface of a non-cylindrical portion of the receiver extension when the actuating spring is in the biased position.