# US 8,782,939 B2 · Bolt action firearm and its method of assembly

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- Number: US 8,782,939 B2
- Document ID: US8782939B2
- Status: Granted
- Kind: B2
- Application number: 13/274,887
- Filed: 2011-10-17
- Published: 2012-02-09
- Granted: 2014-07-22
- Earliest claimed: 2007-01-10
- Assignees: Smith & Wesson Corp.
- Applicants: Robert L. Constant; Richard A. Picard; John Pliska
- Inventors: Robert L. Constant; Richard A. Picard; John Pliska
- Web page: https://patentgrep.com/patent/US8782939B2

## CPC

- F41A 3/66: Breech housings or frames; Receivers
- F41A 3/12: Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
- F41A 3/22: the locking being effected by rotating the operating handle or lever transversely to the barrel axis
- F41A 21/482: {using continuous threads on the barrel}
- F41G 11/003: {Mountings with a dove tail element, e.g. "Picatinny rail systems"}
- Y10T 29/49826: Assembling or joining
- F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41G: WEAPON SIGHTS; AIMING (optical aspects thereof G02B)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Several improvements to the components and assembly method of a bolt-action firearm are disclosed. An improved bolt includes two separate members, which makes the bolt less expensive to manufacture while having a stronger extension handle. An improved takedown system and buttonless stop provide two easy ways to remove a bolt from a receiver when desired without misplacing any parts. An improved scope mount has a base connected to a receiver with two ends that substantially cover the top surface of the receiver and a middle portion that is narrowed over an opening to the receiver to accommodate a cartridge. A method of assembling a firearm involves providing a barrel with a threaded portion, fitting a crush washer over the threaded portion, inserting the threaded portion into a corresponding threaded portion of a receiver, and adjusting the barrel about the crush washer until a proper headspace is achieved.

## Claims

### Claim 1

A method of assembling a firearm, comprising the steps of:
providing a barrel with a threaded portion at one end and a barrel chamber capable of seating a cartridge;
fitting a crush washer over said threaded portion of said barrel;
inserting said threaded portion of said barrel into a corresponding threaded portion of a receiver, wherein a bolt with a face is enclosed within said receiver and is adapted to travel in an open and closed position within said receiver; and
adjusting said barrel about said crush washer and compressing said crush washer until a desired headspace is achieved, wherein said headspace is the distance between said face of said bolt in said closed position and said barrel chamber on which said cartridge seats.

### Claim 2 (depends on 1)

The method according to claim 1, wherein said crush washer has a recoil lug.

### Claim 3 (depends on 1)

The method according to claim 1, wherein said adjusting step comprises tightening said barrel about said crush washer.

### Claim 4 (depends on 1)

The method according to claim 1, wherein said adjusting step comprises adjusting said barrel about said crush washer without disassembling said firearm.

### Claim 5

A method of establishing head spacing of a firearm, said method comprising:
using a barrel with a threaded portion at a breech end thereof;
locating a crush washer against a surface of said barrel at said breech end;
engaging said threaded portion of said barrel with a corresponding threaded portion of a receiver, said crush washer being captured between said surface of said barrel and a facing surface on said receiver;
positioning a bolt within said receiver in a closed position, said bolt having a bolt face;
measuring a head space between said bolt face and said breech end of said barrel;
if said head space is different from a desired value, rotating said barrel and said receiver relatively to one another to change said head space by compressing said crush washer; and
repeating said measuring, rotating and compressing steps until a desired headspace is achieved.