Firearm stock adjustment system
A firearm stock extension assembly enables a stock to be collapsed when a firearm is not in active use, and extended from a collapsed configuration directly to the user's preferred stock length. This is accomplished without requiring the user to actuate a lever to release a detent mechanism and without the need for hand tools to adjust the length of the stock. The firearm stock extension assembly includes an insert that defines at least one insert aperture. When properly placed, the insert aperture of the insert lines up with a corresponding extension aperture on the stock. Other than the corresponding extension aperture exposed by the insert aperture, all other extension apertures are concealed by the solid portions of the insert.
1. A firearm stock extension assembly comprising:
a stock extension having a longitudinal axis;
an extension frame connected to the stock extension, the extension frame defining:
two channels parallel to the longitudinal axis of the stock extension;
a plurality of extension apertures; and
an insert configured to be removably disposed within the two channels of the extension frame in a direction parallel to the longitudinal axis of the stock extension, the insert defining at least one insert aperture configured to align with at least one of the plurality of extension apertures upon insertion of the insert into the two channels parallel to the longitudinal axis of the stock extension.
2. The firearm stock extension assembly of claim 1 , wherein the insert further comprises:
a distal end;
a proximal end proximate to a user contact surface of a firearm stock, the proximal end opposite the distal end; and
a first positive salient feature disposed proximate to the distal end of the insert, the first positive salient feature configured to deter unintentional extension of the firearm stock extension assembly.
3. The firearm stock extension assembly of claim 1 , wherein the insert further comprises:
a distal end;
a proximal end proximate to a user contact surface of a firearm stock, the proximal end opposite the distal end; and
at least one second positive salient feature, each of the at least one second positive salient features disposed
adjacent to a corresponding one of the at least one insert apertures and
between the corresponding insert aperture and the proximal end,
wherein each of the at least one second positive salient features is configured to deter unintentional over-extension of the firearm stock extension assembly beyond the corresponding at least one insert aperture.
4. The firearm stock extension assembly of claim 1 , further comprising an end cap configured to mount to an open end of the two channels defined by the extension frame.
5. The firearm stock extension assembly of claim 4 , wherein:
the extension frame defines a threaded hole proximate to the open end; and
the end cap defines a through-hole configured to align with the threaded hole when the end cap is mounted to the open end of the two channels.
6. The firearm stock extension assembly of claim 1 , wherein each of the at least one insert apertures defined by the insert are ellipses, a major axis of each ellipse parallel to the longitudinal axis of the stock extension.
7. The firearm stock extension assembly of claim 1 , wherein each extension aperture of the plurality and each of the at least one insert apertures are configured to receive a pin of a stock detent mechanism that, when received by an extension aperture aligned with an insert aperture, locks the stock extension into a position corresponding to the extension aperture.
8. An adjustable firearm stock assembly comprising:
an adjustable stock comprising:
a stock;
a chamber disposed within the stock;
a detent mechanism comprising a pin;
a stock extension configured to be at least partially disposed within the chamber of the adjustable stock, the stock extension having a longitudinal axis;
an extension frame connected to the stock extension, the extension frame defining:
two channels parallel to the longitudinal axis of the stock extension;
a plurality of extension apertures; and
an insert configured to be removably disposed within the two channels of the extension frame in a direction parallel to the longitudinal axis of the stock extension, the insert defining at least one insert aperture configured to align with at least one of the plurality of extension apertures upon insertion of the insert into the two channels parallel to the longitudinal axis of the stock extension.
9. The adjustable firearm stock assembly of claim 8 , wherein the insert further comprises:
a distal end;
a proximal end proximate to a user contact surface of the stock, the proximal end opposite the distal end; and
a first positive salient feature disposed proximate to the distal end of the insert, the first positive salient feature configured to deter unintentional extension of the adjustable firearm stock assembly.
10. The adjustable firearm stock assembly of claim 8 , wherein the insert further comprises:
a distal end;
a proximal end proximate to a user contact surface of the stock, the proximal end opposite the distal end; and
at least one second positive salient feature, each of the at least one second positive salient features disposed
adjacent to a corresponding one of the at least one insert apertures, and
between the corresponding insert aperture and the proximal end,
wherein each of the at least one second positive salient features is configured to deter unintentional over-extension of the adjustable firearm stock assembly beyond the adjacent corresponding at least one insert aperture.
11. The adjustable firearm stock assembly of claim 8 , further comprising an end cap configured to mount to an open end of the two channels defined by the extension frame.
12. The adjustable firearm stock assembly of claim 11 , wherein:
the extension frame defines a threaded hole proximate to the open end; and
the end cap defines a through-hole configured to align with the threaded hole when the end cap is mounted to the open end of the two channels.
13. The adjustable firearm stock assembly of claim 8 , wherein each of the at least one insert apertures defined by the insert are ellipses, a major axis of each ellipse parallel to the longitudinal axis of the stock extension.
14. The adjustable firearm stock assembly of claim 8 , wherein each extension aperture of the plurality and each of the at least one insert apertures are configured to receive the pin of the detent mechanism that, when received by an extension aperture aligned with an insert aperture, locks the stock extension into a position corresponding to the extension aperture.
15. A firearm comprising:
a firing chamber;
a firing pin proximate to the firing chamber;
a trigger connected to the firing pin;
an adjustable stock comprising:
a stock;
a chamber disposed within the stock;
a detent mechanism comprising a pin;
a stock extension configured to be at least partially disposed within the chamber of the adjustable stock, the stock extension having a longitudinal axis;
an extension frame connected to the stock extension, the extension frame defining:
two channels parallel to the longitudinal axis of the stock extension;
a plurality of extension apertures; and
an insert configured to be removably disposed within the two channels of the extension frame in a direction parallel to the longitudinal axis of the stock extension, the insert defining at least one insert aperture configured to align with at least one of the plurality of extension apertures upon insertion of the insert into the two channels parallel to the longitudinal axis of the stock extension.
16. The firearm of claim 15 , wherein the insert further comprises:
a distal end;
a proximal end proximate to a user contact surface of the stock, the proximal end opposite the distal end; and
a first positive salient feature disposed proximate to the distal end of the insert, the first positive salient feature configured to deter unintentional extension of the adjustable stock.
17. The firearm of claim 15 , wherein the insert further comprises:
a distal end;
a proximal end proximate to a user contact surface of the stock, the proximal end opposite the distal end; and
at least one second positive salient feature disposed
adjacent to a corresponding one of the at least one insert apertures and
between the corresponding insert apertures and the proximal end,
wherein each of the at least one second positive salient feature is configured to deter unintentional over-extension of the adjustable stock beyond the adjacent corresponding at least one insert aperture.
18. The firearm of claim 15 , wherein each of the at least one insert apertures defined by the insert are ellipses, a major axis of each ellipse parallel to the longitudinal axis of the stock extension.
19. The firearm of claim 15 , wherein each extension aperture of the plurality and each of the at least one insert apertures are configured to receive the pin of the detent mechanism that, when received by an extension aperture aligned with an insert aperture, locks the stock extension into a position corresponding to the extension aperture.