Quick change barrel system for a firearm

• US 7,574,823 B2
• Filed: 01/11/2008
• Issued: 08/18/2009
• Est. Priority Date: 01/11/2007
• Status: Active Grant

• Current Assignee: Magpul Industries
• Original Assignee: Magpul Industries
• Inventors: Nakayama, Brian
• Primary Examiner(s): Carone; Michael
• Assistant Examiner(s): Abdosh; Samir
• Application Number:
  US12/013,401
• Publication Number:
  US 20080168695A1
• Time in Patent Office: 585 Days
• Field of Search: 42/750.1, 42/750.2, 42/750.4
• US Class Current: 42/75.02
• CPC Class Codes: F41A 21/481 using partial or interrupted threads, e.g. bayonet-type mountings

Abstract

The present invention is an improved quick change barrel system for a firearm. It features an interlocking trunnion and lock ring that hold the barrel in place proximate the receiver. Intermittent threading provides multiple points of interface. A foldable handle is provided to allow safe removal of the lock ring and additional torque for attachment and removal of the lock ring from the system.

Claims

1. A quick connection barrel system for a firearm, comprising:

a. a barrel having an external flange proximate a rear end;

b. a barrel trunnion located in the firearm and having non-continuous interrupted threading;

c. a barrel lock ring located such that the flange is between the barrel lock ring and the barrel trunnion and having non-continuous interrupted threading to mate with non-continuous interrupted threading on the barrel trunnion with the flange still between the lock ring and the barrel trunnion;

wherein the barrel lock ring and barrel trunnion operate together to cam the flange in place so that the barrel, while held in place between the lock ring and barrel trunnion, is not otherwise attached to the lock ring.

2. The system of claim 1, further comprising a spring-biased locking pin and an interfacing surface, said surface located on a circumference of the barrel lock ring and the locking pin located in the barrel trunnion in a manner to engage the interfacing surface when the system is assembled and the locking pin is in its biased position.

3. The system of claim 2, the lock ring farther comprising a handle, radially spaced from a center point of the lock ring.

4. The system of claim 3, the handle being foldable along a length of the barrel when the system is assembled.

5. The system of claim 1, the lock ring farther comprising a handle, radially spaced from a center point of the lock ring.

6. The system of claim 5, the handle being foldable along a length of the barrel when the system is assembled.