Barrel extension extraction cam and barrel extension system

A bolt extraction system for bolt-action rifles, comprising:

• a bolt comprising a bolt head coupled to and axially aligned with a bolt tail, wherein the bolt head comprises a bolt face which is forward facing and the bolt tail comprises a tail surface, and the bolt face is opposite of the tail surface, and wherein the bolt further comprises:
• a plurality of bolt head lugs circumferentially disposed around the bolt head and separated by gaps, wherein each of the bolt head lugs contains a front surface opposite a rear surface and a first side surface opposite a second side surface;
• and
• a plurality of extraction lugs circumferentially disposed around the bolt head, wherein each of the extraction lugs has an engagement surface which is forward facing, and wherein each of the extraction lugs is circumferentially aligned with a respective gap disposed between each pair of the bolt head lugs;
• and
• a barrel extension comprising a passageway extending from a front side to a rear side of the barrel extension, wherein the passageway at the front side is configured to accept a firearm barrel and the passageway at the rear side is configured to accept the bolt head, the barrel extension further comprises:
• a plurality of barrel extension lugs circumferentially disposed on an inner surface of the barrel extension within the passageway, wherein each of the barrel extension lugs contains an extraction cam surface which is rear facing, and wherein each of the extraction cam surfaces is circumferentially angled from the rear side towards the front side of the barrel extension.

A rifle, comprising:

• a receiver;
• a barrel;
• a barrel extension coupled to the receiver and the barrel;
• and
• a bolt assembly disposed in the receiver;
• wherein the bolt comprises a bolt head coupled to and axially aligned with a bolt tail, wherein the bolt head comprises a bolt face which is forward facing and the bolt tail comprises a tail surface, and the bolt face is opposite of the tail surface, and wherein the bolt further comprises:
• a plurality of bolt head lugs circumferentially disposed around the bolt head and separated by gaps, wherein each of the bolt head lugs contains a front surface opposite a rear surface and a first side surface opposite a second side surface;
• and
• a plurality of extraction lugs circumferentially disposed around the bolt head, wherein each of the extraction lugs has an engagement surface which is forward facing, and wherein each of the extraction lugs is circumferentially aligned with a respective gap disposed between each pair of the bolt head lugs;
• and
• wherein the barrel extension comprises a passageway extending from a front side to a rear side of the barrel extension, wherein the passageway at the front side is configured to accept a firearm barrel and the passageway at the rear side is configured to accept the bolt head, the barrel extension further comprises:
• a plurality of barrel extension lugs circumferentially disposed on an inner surface of the barrel extension within the passageway, wherein each of the barrel extension lugs contains an extraction cam surface which is rear facing, and wherein each of the extraction cam surfaces is circumferentially angled from the rear side towards the front side of the barrel extension.