Grooved firearm chamber

Abstract

In various embodiments, a firearm assembly devices, systems and methods are provided. The firearm assembly can comprise a barrel and a chamber comprising a channel. The chamber may have a first length. The chamber may comprise an internal wall defining an internal cavity. The chamber can also couple to the barrel. The channel can be defined in the internal wall of the chamber. The channel may have a second length that is shorter than the first length. In various embodiments, the firearm assembly may be a component of a rotating bolt firearm. In various embodiments, internal cavity of the firearm assembly has a profile configured to receive a cartridge. The devices systems and methods described herein reduce common rotating bolt firearm failure modes by encouraging case ejection, compression, and/or contraction.

What is claimed is: 
     
         1 . A firearm configured to fire a cartridge comprising a case and a bullet, comprising:
 an upper receiver,   a barrel detachably coupled to the upper receiver, the barrel comprising a chamber portion, the chamber configured to operatively receive the cartridge;   the chamber portion comprising a first groove defined in the chamber portion and in fluid communication with the barrel and a second grove defined in the chamber portion in fluid communication with the barrel, wherein the first groove and the second groove are configured to direct gas from the barrel into the chamber portion create a force on an exterior surface of the case in response to the cartridge being activated.   
     
     
         2 . The firearm of  claim 1 , wherein the case comprises a shoulder and wherein the force is applied to the shoulder. 
     
     
         3 . The firearm of  claim 1 , wherein the first groove and the second groove are defined in a wall defining a diameter of the chamber portion. 
     
     
         4 . The firearm of  claim 1 , wherein a centerline of the barrel is defined along a center of a diameter of the barrel. 
     
     
         5 . The firearm of  claim 4 , wherein a first component of the force is applied to the case in a direction substantially perpendicular to the centerline of the barrel and a second component of the force is applied in a direction substantially parallel to the centerline of the barrel. 
     
     
         6 . A rotating bolt firearm, comprising:
 a gas operating system,   a bolt rotatably moveable between a first position and a second position;   a barrel comprising a chamber portion configured to receive the bolt, the chamber portion comprising a first channel;   a volume defined by the barrel in fluid communication with the gas operating system and the first channel, wherein pressure from an activation of a cartridge causes gas to pressurize an outer surface of a cartridge via the first channel, during a time period between the activation of the cartridge and the pressure actuating the gas operating system.   
     
     
         7 . The rotating bolt firearm of  claim 6 , wherein the first channel is defined in an interior surface of the chamber portion. 
     
     
         8 . The rotating bolt firearm of  claim 6 , wherein the chamber portion further comprises a second channel. 
     
     
         9 . The rotating bolt firearm of  claim 6 , wherein the actuating the gas operating system causes the bolt to rotate from the first position to the second position. 
     
     
         10 . The rotating bolt firearm of  claim 6 , wherein the actuating the gas operating system causes the cartridge to eject from the chamber portion. 
     
     
         11 . The rotating bolt firearm of  claim 6 , wherein the gas creates a three that is exerting on the outer surface of the cartridge. 
     
     
         12 . A firearm assembly, comprising:
 a barrel;   a chamber comprising an internal wall defining an internal cavity and coupled to the barrel, that chamber having a first length; and   a first channel defined in the internal wall of the chamber and having a second length that is shorter than the first length.   
     
     
         13 . The firearm assembly of  claim 12 , wherein the firearm assembly is a component of a rotating bolt firearm. 
     
     
         14 . The firearm assembly of  claim 12 , wherein the internal cavity comprises a profile configured to receive a cartridge. 
     
     
         15 . The firearm assembly of  claim 12 , wherein the channel is connected to the barrel. 
     
     
         16 . The firearm assembly of  claim 12 , wherein the channel is in fluid communication with at least one of the barrel and the chamber. 
     
     
         17 . The firearm of assembly of  claim 12 , wherein the channel has at least one of a generally circular profile, a generally square profile, a generally triangular profile, and a generally rectangular profile. 
     
     
         18 . The firearm assembly of  claim 12 , wherein the chamber comprises a second channel. 
     
     
         19 . The firearm assembly of  claim 18 , wherein the second channel is substantially identical and equidistantly spaced from the first channel. 
     
     
         20 . The firearm assembly of  claim 18 , wherein the second channel is not substantially identical and not equidistantly spaced from the first channel.