Adjustable stock systems for firearms

1. An adjustable stock system for a firearm, comprising:

a buttstock configured to be slidably attached to the firearm for moving relative to the firearm between a collapsed position and at least one extended position, wherein the buttstock includes a plurality of buttstock grooves defined therein;

a lever including at least one lever tooth configured to mate with the plurality of buttstock grooves in a latched position, the lever configured to mount to the firearm and to be moveable relative to the buttstock between the latched position where the buttstock cannot slide relative to the firearm, and an unlatched position where the buttstock is free to slide relative to the firearm, wherein the lever is biased to the latched position; and

an actuator configured to move the lever between the latched position and the unlatched position, wherein buttstock is biased to the at least one extended position, wherein the buttstock is biased with one or more internal springs disposed within the buttstock, wherein the buttstock is configured to be slidably mounted over a buffer tube of the firearm, wherein the one or more internal springs are positioned between the buffer tube and an internal surface of the butt stock to bias the buttstock to the at least one extended position.

2. The system of claim 1 , wherein the lever includes a plurality of lever teeth configured to mate with the plurality of buttstock grooves in a latched position.

3. The system of claim 1 , wherein the lever is configured to be mounted to the firearm via a hinge.

4. The system of claim 1 , wherein the actuator is configured to be positioned adjacent a grip of the firearm when the system is installed on a firearm such that a user can actuate the lever without removing a hand from the grip.

5. The system of claim 4 , wherein the actuator is configured to be positioned above a thumb of the user when the system is installed on the firearm such that the user's thumb can actuate the actuator.

6. The system of claim 1 , further comprising an anchor system configured to be positioned in front of a castle nut of a buffer tube of the firearm in an open position, and to clamp around the buffer tube to be compressed by the castle nut in a closed position.

7. The system of claim 6 , wherein the anchor system includes:

a base plate defining an opening dimensioned to slide over the buffer tube past the castle nut; and

a pair of arms moveably mounted to the base plate to move between the open position and the closed position, wherein the arms clamp against the buffer tube in the closed position such that the castle nut can be compressed against the arms in a closed position to retain the anchor assembly.

8. An adjustable stock system for a firearm, comprising:

a buttstock configured to be slidably attached to the firearm for moving relative to the firearm between a collapsed position and at least one extended position, wherein the buttstock includes a plurality of buttstock grooves defined therein;

a lever including at least one lever tooth configured to mate with the plurality of buttstock grooves in a latched position, the lever configured to mount to the firearm and to be moveable relative to the buttstock between the latched position where the buttstock cannot slide relative to the firearm, and an unlatched position where the buttstock is free to slide relative to the firearm, wherein the lever is biased to the latched position;

an actuator configured to move the lever between the latched position and the unlatched position; and

an anchor system configured to be positioned in front of a castle nut of a buffer tube of the firearm in an open position, and to clamp around the buffer tube to be compressed by the castle nut in a closed position, wherein the anchor system includes:

a base plate defining an opening dimensioned to slide over the buffer tube past the castle nut; and

a pair of arms moveably mounted to the base plate to move between the open position and the closed position, wherein the arms clamp against the buffer tube in the closed position such that the castle nut can be compressed against the arms in a closed position to retain the anchor assembly.

9. An adjustable stock system for a firearm, comprising:

a buttstock configured to be slidably attached to the firearm for moving relative to the firearm between a collapsed position and at least one extended position, wherein the buttstock includes a plurality of buttstock grooves defined therein, wherein buttstock is configured to be biased to the at least one extended position, wherein the buttstock is configured to be slidably mounted over a buffer tube of the firearm;

a lever including at least one lever tooth configured to mate with the plurality of buttstock grooves in a latched position, the lever configured to mount to the firearm and to be moveable relative to the buttstock between the latched position where the buttstock cannot slide relative to the firearm, and an unlatched position where the buttstock is free to slide relative to the firearm, wherein the lever is biased to the latched position;

an actuator configured to move the lever between the latched position and the unlatched position; and

one or more internal springs disposed within the buttstock and configured to bias the buttstock to the at least one extended position, wherein the one or more internal springs are positioned within the buttstock to be between the buffer tube and an internal surface of the buttstock when the buttstock is mounted to the buffer tube to bias the buttstock to the at least one extended position.

10. The system of claim 9 , wherein the lever includes a plurality of lever teeth configured to mate with the plurality of buttstock grooves in a latched position.

11. The system of claim 9 , wherein the lever is configured to be mounted to the firearm via a hinge.

12. The system of claim 9 , wherein the actuator is configured to be positioned adjacent a grip of the firearm when the system is installed on a firearm such that a user can actuate the lever without removing a hand from the grip.

13. The system of claim 12 , wherein the actuator is configured to be positioned above a thumb of the user when the system is installed on the firearm such that the user's thumb can actuate the actuator.

14. The system of claim 9 , further comprising an anchor system configured to be positioned in front of a castle nut of a buffer tube of the firearm in an open position, and to clamp around the buffer tube to be compressed by the castle nut in a closed position.

15. The system of claim 14 , wherein the anchor system includes:

a base plate defining an opening dimensioned to slide over the buffer tube past the castle nut; and

a pair of arms moveably mounted to the base plate to move between the open position and the closed position, wherein the arms clamp against the buffer tube in the closed position such that the castle nut can be compressed against the arms in a closed position to retain the anchor assembly.