Quick-change barrel for a firearm

A firearm comprising:

• a quick-change barrel including:
• (a) at least two barrel-mounting features, each configured to selectively interact with a barrel-receipt feature of the firearm during mounting of the quick-change barrel to a mounting structure of the firearm, or
• (b) at least one barrel-mounting feature configured to selectively interact with at least two barrel-receipt features of the firearm during mounting of the quick-change barrel to a mounting structure of the firearm, such that the quick-change barrel is selectively mountable to the firearm in at least two orientations depending, per (a), upon which of the at least two barrel-mounting features interact with the barrel-receipt feature or, per (b), upon which of the at least two barrel-receipt features interact with the barrel-mounting feature;
• and
• barrel locking flanges configured to engage locking flanges provided by the mounting structure, wherein (a) the at least two barrel-mounting features include a first barrel slot and a second barrel slot, and the barrel-receipt feature is an alignment stud, or wherein (b) the at least two barrel-receipt features include a first barrel support slot in the firearm and a second barrel support slot in the firearm, and the at least one barrel-mounting feature is an alignment stud.

A firearm comprising:

• a quick-change barrel including:
• (a) at least two barrel-mounting features, each configured to selectively interact with a barrel-receipt feature of the firearm during mounting of the quick-change barrel to a mounting structure of the firearm, or
• (b) at least one barrel-mounting feature configured to selectively interact with at least two barrel-receipt features of the firearm during mounting of the quick-change barrel to a mounting structure of the firearm, such that the quick-change barrel is selectively mountable to the firearm in at least two orientations depending, per (a), upon which of the at least two barrel-mounting features interact with the barrel-receipt feature or, per (b), upon which of the at least two barrel-receipt features interact with the barrel-mounting feature;
• wherein (a) the at least two barrel-mounting features include a first barrel slot and a second barrel slot, and the barrel-receipt feature is an alignment stud, or wherein (b) the at least two barrel-receipt features include a first barrel support slot in the firearm and a second barrel support slot in the firearm, and the at least one barrel-mounting feature is an alignment stud;
• and
• wherein the first barrel slot comprises:
• a first slot entrance section;
• a first circumferential section;
• a first cycle section;
• wherein the first slot entrance section extends axially along the length of the barrel and is in communication with the first circumferential section, wherein the first circumferential section is in communication with the first cycle section, and wherein the first cycle section is oriented axially with the length of the barrel;
• wherein the second barrel slot comprises:
• a second slot entrance section;
• a second circumferential section;
• a second cycle section;
• and
• wherein the second slot entrance section extends axially along the length of the barrel and is in communication with the second circumferential section, wherein the second circumferential section is in communication with the second cycle section, and wherein the second cycle section is oriented axially with the length of the barrel.

A firearm comprising:

• a quick-change barrel including:
• (a) at least two barrel-mounting features, each configured to selectively interact with a barrel-receipt feature of the firearm during mounting of the quick-change barrel to a mounting structure of the firearm, or
• (b) at least one barrel-mounting feature configured to selectively interact with at least two barrel-receipt features of the firearm during mounting of the quick-change barrel to a mounting structure of the firearm, such that the quick-change barrel is selectively mountable to the firearm in at least two orientations depending, per (a), upon which of the at least two barrel-mounting features interact with the barrel-receipt feature or, per (b), upon which of the at least two barrel-receipt features interact with the barrel-mounting feature;
• and
• wherein the quick-change barrel is configured so that the quick-change barrel can be mounted to and removed from the firearm without requiring the actuation or manipulation of any push buttons, levers, handles, rings, locking mechanisms, retainers, holders, aligners, or the opening, closing or manipulation of any partitions, doors, receiver sections, covers, guards, or anything else designed or intended to act as a barrel retaining or position holding/locking device.

A quick-change barrel for a firearm comprising:

• at least two barrel-mounting features, each configured to selectively interact with a barrel-receipt feature of the firearm during mounting of the quick-change barrel to the firearm, such that the quick-change barrel is selectively mountable to the firearm in at least two orientations depending upon which of the at least two barrel-mounting features interact with the barrel-receipt feature, wherein the at least two barrel-mounting features include a first barrel slot and a second barrel slot, and wherein the first barrel slot comprises:
• a first slot entrance section;
• a first circumferential section;
• a first cycle section;
• wherein the first slot entrance section extends axially along the length of the barrel and is in communication with the first circumferential section, wherein the first circumferential section is in communication with the first cycle section, and wherein the first cycle section is oriented axially with the length of the barrel;
• wherein the second barrel slot comprises:
• a second slot entrance section;
• a second circumferential section;
• a second cycle section;
• and
• wherein the second slot entrance section extends axially along the length of the barrel and is in communication with the second circumferential section, wherein the second circumferential section is in communication with the second cycle section, and wherein the second cycle section is oriented axially with the length of the barrel.

A firearm comprising:

• at least two barrel-receipt features, each configured to selectively interact with a barrel-mounting feature of a quick-change barrel during mounting of the quick-change barrel to a mounting structure of the firearm, such that the firearm can selectively receive a quick-change in at least two mounted orientations depending upon which of the at least two barrel-receipt features interact with the barrel-mounting feature;
• wherein the at least two barrel-receipt features include a first barrel slot and a second barrel slot, and wherein the first barrel slot comprises:
• a first slot entrance section;
• a first circumferential section;
• a first cycle section;
• wherein the first slot entrance section extends axially along the length of the firearm and is in communication with the first circumferential section, wherein the first circumferential section is in communication with the first cycle section, and wherein the first cycle section is oriented axially with the length of the firearm;
• wherein the second barrel slot comprises:
• a second slot entrance section;
• a second circumferential section;
• a second cycle section;
• and
• wherein the second slot entrance section extends axially along the length of the firearm and is in communication with the second circumferential section, wherein the second circumferential section is in communication with the second cycle section, and wherein the second cycle section is oriented axially with the length of the firearm.