Firearm end plate and anti-loose castle nut

Patent metadata

Field	Value
Publication number	US-10794645-B2
Application number	US-201916256786-A
Country	US
Kind code	B2
Filing date	Jan 24, 2019
Priority date	Jul 20, 2018
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A castle nut has a groove around an exterior circumference thereof. An end plate has a through hole extending in a direction perpendicular to a longitudinal axis of a firearm. When a buffer tube is threaded onto a lower receiver of the firearm with the buffer tube traversing through the castle nut and the end plate, the castle nut can be screwed in a direction toward the lower receiver to fasten the end plate against the lower receiver. When the end plate is fastened against the lower receiver by the castle nut, the securing device can be screwed into the through hole of the end plate such that a portion of the securing device is engaged with the groove of the castle nut to prevent the castle nut to be loosened by being unscrewed in a direction away from the lower receiver.

First claim

What is claimed is:

1. An apparatus implementable on a firearm, comprising:
a castle nut having a groove around an exterior circumference of the castle nut;
a receiver end plate having a through hole extending in a direction perpendicular to a longitudinal axis and along a horizontal plane of the firearm; and
a generally cylindrical-shaped securing device,
wherein, when a buffer tube is threaded onto a lower receiver of the firearm with the buffer tube traversing through the castle nut and the receiver end plate, the castle nut is configured to be screwed in a direction toward the lower receiver to fasten the receiver end plate against the lower receiver, and
wherein, when the receiver end plate is fastened against the lower receiver by the castle nut, the securing device is configured to be received in the through hole of the receiver end plate such that a portion of the securing device is horizontally received in the groove of the castle nut to prevent the castle nut to be loosened by being unscrewed in a direction away from the lower receiver.

2. The apparatus of claim 1 , wherein the securing device comprises a set screw or pin screw, and wherein the through hole comprises a threaded through hole.

3. The apparatus of claim 1 , wherein the securing device comprises a roll pin or dowel pin.

4. The apparatus of claim 1 , wherein the firearm comprises an AR-15 styled pistol, rifle, carbine or shotgun.

5. The apparatus of claim 1 , further comprising:
the buffer tube.

6. The apparatus of claim 1 , further comprising:
the lower receiver.

7. The apparatus of claim 1 , further comprising:
the buffer tube; and
the lower receiver.

8. An apparatus implementable on a firearm, comprising:
a castle nut having a groove around an exterior circumference of the castle nut;
a receiver end plate having a through hole extending in a direction perpendicular to a longitudinal axis and along a horizontal plane of the firearm; and
a generally cylindrical-shaped securing device,
wherein, when a buffer tube is threaded onto a lower receiver of the firearm with the buffer tube traversing through the castle nut and the receiver end plate, the castle nut is configured to be screwed in a direction toward the lower receiver to fasten the receiver end plate against the lower receiver,
wherein, when the receiver end plate is fastened against the lower receiver by the castle nut, the groove of the castle nut is aligned with the through hole of the receiver end plate, and
wherein, when the receiver end plate is fastened against the lower receiver by the castle nut, the securing device is configured to be screwed into the through hole of the receiver end plate such that a portion of the securing device is horizontally received in the groove of the castle nut to prevent the castle nut to be loosened by being unscrewed in a direction away from the lower receiver.

9. The apparatus of claim 8 , wherein the firearm comprises an AR-15 styled pistol, rifle, carbine or shotgun.

10. The apparatus of claim 8 , wherein the securing device comprises a set screw or pin screw, and wherein the through hole comprises a threaded through hole.

11. The apparatus of claim 8 , wherein the securing device comprises a roll pin or dowel pin.

12. The apparatus of claim 8 , further comprising:
the buffer tube.

13. The apparatus of claim 8 , further comprising:
the lower receiver.

14. The apparatus of claim 8 , further comprising:
the buffer tube; and
the lower receiver.

Assignees

• Strike Ind Inc

Inventors

• Chin David Hyung

Classifications

• F41A3/66 Primary

  Breech housings or frames; Receivers · CPC title

• F41A3/84

  mounted within the gun stock · CPC title

• F16B39/02

  in which the locking takes place after screwing down (F16B39/01 takes precedence; split-pins, circlips, or the like for preventing relative axial movement only F16B21/10; fastening nuts by welding or riveting F16B37/06) · CPC title

• F16B39/04

  with a member penetrating the screw-threaded surface of at least one part, e.g. a pin, a wedge, cotter-pin, screw · CPC title