Stock for a firearm

• US 9,404,708 B1
• Filed: 06/30/2015
• Issued: 08/02/2016
• Est. Priority Date: 06/30/2015
• Status: Active Grant

• Current Assignee: Magpul Industries
• Original Assignee: Magpul Industries
• Inventors: Chow, Eric, Sessions, Turner
• Primary Examiner(s): Johnson, Stephen M
• Application Number:
  US14/788,025
• Time in Patent Office: 399 Days
• Field of Search: 42/73, 42/74
• US Class Current: 1/1
• CPC Class Codes: F41C 23/06 Stocks or firearm frames specially adapted for recoil reduction
• CPC Class Codes: F41C 23/14 Adjustable stock or stock parts, i.e. adaptable to personal requirements, e.g. length, pitch, cast or drop

Abstract

A stock for a firearm is disclosed. The stock has a length of pull (LOP) adjustment mechanism. The LOP adjustment mechanism is biased towards an engaged configuration and is movable to a disengaged configuration. A locating member protrudes into a stock mounting space and a first arm is in an engagement position when the LOP adjustment mechanism is in the engaged configuration. The locating member is translated such that the locating member does not protrude into the mounting space and the first arm is pivoted into a disengagement position when the LOP adjustment mechanism is in the disengaged configuration.

Claims

1. A stock for a firearm, comprising:

a proximal end shaped to allow a user to brace the stock;

a distal end shaped to interface with a firearm;

a longitudinal axis fixed by a firing direction of the stock and extending between the proximal end and the distal end of the stock;

a housing including a firearm mounting space along the longitudinal axis, the mounting space shaped to slidingly engage a receiving component of the firearm, the housing having a lower portion with at least one rail, a locating member hole, and a first lever arm entry; and

a length of pull adjustment mechanism;

wherein the length of pull adjustment mechanism;

a) includes a locating member translatable along an axis of the locating member hole in the housing;

b) includes a first lever having a first arm extending from a lever pivot axis through the first lever arm entry and into the mounting space and a second arm extending in a different direction from the lever pivot axis, the first arm shaped to abut the receiving component of the firearm;

c) is biased towards an engaged configuration wherein a top portion of the locating member protrudes into the mounting space and the first arm is in an engagement position wherein a portion of the first arm abuts the receiving component; and

d) has a disengaged configuration wherein the locating member is translated such that the upper portion does not protrude into the mounting space, and the first arm is pivoted away from the receiving component and into a disengagement position.

2. The stock of claim 1, wherein:

the first arm of the first lever includes a distal portion having a curved surface shaped to engage the receiving component of the firearm.

3. The stock of claim 1, wherein:

the housing comprises a protrusion shaped and positioned to limit outward flexure of a distal portion of the first arm when the first lever is in the engagement position.

4. The stock of claim 1, further comprising:

a transverse member extending between the locating member and the first arm, the transverse member slidingly engaged with the first arm.

5. The stock of claim 4, wherein:

the stock comprises a second lever opposing the first lever, the second lever configured to abut the receiving component of the firearm when in an engaged position;

the transverse member is a cylindrical pin without a notch; and

interior surfaces of the first lever and the second lever limit the transverse member from sliding relative to the locating member when the first lever and the second lever abut the receiving component of the firearm.

6. The stock of claim 4, further comprising:

a second lever having a first arm and a second arm, the second lever opposing the first lever and configured to abut the receiving component of the firearm when in an engaged position;

wherein

the transverse member extends between the first arm of the second lever and the first arm of the first lever, the transverse member slidingly engaged with the first arm of the second lever and the first arm of the first lever.

7. The stock of claim 1, wherein:

the receiving component of the firearm is manufactured within a minimum tolerance stack-up and a maximum tolerance stack-up;

a distal end of the first arm is configured to abut the receiving component when the length of pull adjustment mechanism is in the engaged configuration and the receiving component has the minimum tolerance stack-up;

the distal end of the first arm is configured to disengage from the firearm when the length of pull adjustment mechanism is in the disengaged configuration and the receiving component has the maximum tolerance stack-up.

8. The stock of claim 1, wherein:

the distal end of the first arm and the locating member are configured to prevent unintentional disengagement when the receiving component has a maximum tolerance stack-up.

9. A stock for a firearm, comprising:

a proximal end shaped to allow a user to brace the stock;

a distal end shaped to interface with a firearm of a firearm;

a longitudinal axis fixed by a firing direction of the stock and extending between the proximal end and the distal end;

a housing including a mounting space along the longitudinal axis, the mounting space shaped to slidingly engage a receiving component of the firearm; and

a length of pull adjustment mechanism movable between an engaged configuration and a disengaged configuration, wherein the length of pull adjustment mechanism comprises a locating member and a first stabilizer arm,

the first stabilizer arm movable between an engaged position when the length of pull adjustment mechanism is in the engaged configuration and a disengaged position when the length of pull adjustment mechanism is in the disengaged configuration,

the first stabilizer arm shaped to abut the receiving component of the firearm and limit transverse movement of the stock relative to the receiving component of the firearm when the length of pull adjustment mechanism is in the engaged configuration,

the first stabilizer arm further shaped to cause the locating member to move between a first position when the length of pull adjustment mechanism is in the engaged configuration and a second position when the length of pull adjustment mechanism is in the disengaged configuration, the locating member shaped to engage a recess in the receiving component of the firearm when the length of pull adjustment mechanism is in the engaged position to select a length of pull.

10. The stock of claim 9, further comprising:

a second stabilizer arm coupled to and opposing the first stabilizer arm and coupled to the locating member;

wherein

movement between the engaged configuration and the disengaged configuration causes the first stabilizer arm and the second stabilizer arm to pivot and the locating member to translate.

11. The stock of claim 9, wherein:

the length of pull adjustment mechanism is biased towards the engaged configuration.

12. The stock of claim 9, wherein:

as the length of pull adjustment mechanism is moved from the disengaged configuration to the engaged configuration, a distal end of the first stabilizer arm and a distal end of the second stabilizer arm are shaped to bottom out against the receiving component of a firearm attached to the stock before the locating member bottoms out against the firearm.

13. The stock of claim 9, further comprising:

a transverse member extending from the locating member and engaging the first stabilizer arm and the second stabilizer arm;

wherein a longitudinal axis of the transverse member is fixed relative to the locating member.

14. A method of manufacturing a stock for a firearm, comprising:

providing a housing including a mounting space along a longitudinal axis, the housing shaped to slidingly engage a receiving component of a firearm and having a lower portion with a rail, a locating member hole, and a first lever arm entry; and

providing a length of pull adjustment mechanism;

wherein the length of pull adjustment mechanism includes a locating member and a first lever having a first arm shaped to abut the receiving component of the firearm and a second arm; and

assembling the housing and the length of pull adjustment mechanism such that;

a) the locating member is translatable along an axis of the locating member hole;

b) the first arm of the first lever extends through the first lever arm entry and into the mounting space;

c) the second arm of the first lever extends from a transverse lever pivot axis in a direction different from the first arm;

d) the length of pull adjustment mechanism is biased towards an engaged configuration wherein a top portion of the locating member protrudes into the mounting space and the first arm is in an engagement position; and

e) the length of pull adjustment mechanism is movable to a disengaged configuration wherein the locating member is translated such that the upper portion does not protrude into the mounting space, and the first arm is pivoted into a disengagement position.

15. The method of claim 14, further comprising:

providing the first arm of the first lever with a distal portion having a curved surface shaped to engage the receiving component of the firearm.

16. The method of claim 14, further comprising:

providing the housing with a protrusion shaped and positioned to limit outward flexure of a distal portion of the first arm when the length of pull adjustment mechanism is in the engaged configuration.

17. The method of claim 14, further comprising:

providing a transverse member extending between the locating member and the first arm, the transverse member engaged with the first arm and pivotally or fixedly engaged with the locating member.

18. The method of claim 14, wherein:

providing the length of pull adjustment mechanism includes providing a length of pull adjustment mechanism that is configured to prevent accidental disengagement when the receiving component of the firearm is at a maximum tolerance stack-up.

19. The method of claim 14, further comprising:

providing a second lever opposing the first lever;

providing a transverse member extending through the locating member and engaging the first lever and the second lever; and

fixing a longitudinal axis of the transverse member relative to the locating member.

20. The method of claim 14, wherein:

providing the housing includes providing the housing with a transverse mount for limiting the first lever to pivotal motion.