Firearm assembly

Abstract

The present invention includes a receiver for a firearm having a front recess to receive a barrel. The receiver has a load/eject recess port open to the front recess and to a side or bottom of the receiver to allow the insertion and removal of a cartridge from the receiver. A slit along the front recess and the load/eject recess port together form a single opening along the receiver whereby the receiver can expand to allow the insertion of a barrel into the front recess. Included is a firearm having the receiver of the invention.

1 . A receiver for a firearm, said receiver comprising: 
 a front, at least two sides, and a bottom;    a front recess to receive a barrel or barrel extension, said front recess defined by a channel in said receiver which is open longitudinally along a longitudinal slit in said receiver;    a load/eject recess open to said front recess and to at least one side or said bottom of said receiver, said load/eject recess sized to allow the insertion and removal of a cartridge from said receiver;    said slit and said load/eject recess together forming a single opening to said receiver whereby said receiver can expand to allow the insertion of a barrel or barrel extension into said front recess.    
   
   
       2 . The receiver of  claim 1  wherein said slit and said load/eject recess are open to said bottom of said receiver.  
   
   
       3 . The receiver of  claim 1  further comprising a clamping hole in said receiver disposed through said longitudinal slit, said clamping hole sized to receive clamping means whereby said slit is compressible by said clamping means to apply a compressive force on a barrel or barrel extension inserted into said front recess.  
   
   
       4 . The receiver of  claim 2  wherein said clamping means is a bolt.  
   
   
       5 . The receiver of  claim 1  wherein said front recess is sized to receive a barrel extension.  
   
   
       6 . The receiver of  claim 2  wherein said receiver has a plurality of clamping holes.  
   
   
       7 . The receiver of  claim 1  wherein said receiver is comprised of a material selected from the group consisting of aluminum, magnesium, or alloys comprised of aluminum or magnesium.  
   
   
       8 . The receiver of  claim 1  wherein said receiver is comprised of a polymeric material.  
   
   
       9 . A receiver for a firearm, said receiver comprising: 
 a front and a bottom;    a front recess to receive a barrel extension, said front recess defined by a channel open longitudinally at its bottom along a longitudinal slit;    a load/eject recess open to said front recess and to said bottom of said receiver to allow the insertion and removal of a cartridge from said bottom of said receiver; and    at least one clamping hole in said receiver, said clamping hole disposed through said longitudinal slit, said clamping hole sized to receive clamping means;    said slit and said load/eject recess together forming a single opening along said bottom of said receiver, and    said front recess is expandable and contractible along said slit whereby said slit is compressible by said clamping means to apply a compressive force on a barrel extension inserted into said front recess.    
   
   
       10 . The receiver of  claim 9  further comprising clamping means.  
   
   
       11 . The receiver of  claim 9  wherein said receiver has a plurality of clamping holes.  
   
   
       12 . The receiver of  claim 9  wherein said receiver is comprised of a material selected from the group consisting of aluminum, magnesium, or alloys comprised of aluminum or magnesium.  
   
   
       13 . The receiver of  claim 9  wherein said receiver is comprised of a polymeric material.  
   
   
       14 . A barrel extension for a firearm barrel, said barrel extension comprising: 
 a metallic tube having an outer surface; and    a protrusion extending radially outward from said outer surface of said metallic tube.    
   
   
       15 . The barrel extension of  claim 14  wherein said protrusion is a pin.  
   
   
       16 . A safety mechanism for a firearm to prevent unintentional firing of the firearm, the safety mechanism comprising: 
 a bolt having: 
 a bolt head disposed at a distal end,  
 a proximal end, and  
 a longitudinal channel disposed in said bolt to house a firing pin;  
   a firing pin disposed in said longitudinal channel of said bolt, said firing pin having a distal end at said bolt head and a proximal end extending out of said longitudinal channel to allow activation of said firing pin by a hammer;    a safety bar disposed at said proximal end of said firing pin wherein rotation of said bolt into a firing position rotates said safety bar into an activation position whereby said firing pin can be activated by a hammer striking said safety bar, and rotation of said bolt into a non-firing position rotates said safety bar out of said activation position whereby a falling hammer cannot strike said safety bar or firing pin.    
   
   
       17 . The safety mechanism of  claim 16  wherein said safety bar is rectangular.  
   
   
       18 . The safety mechanism of  claim 16  wherein said safety bar has at least one curved edge.  
   
   
       19 . The safety mechanism of  claim 16  wherein the bolt rotation between said activation position and said non-firing position is an angle between 20° and 50° from the bolt's fully closed position.  
   
   
       20 . The safety mechanism of  claim 18  wherein the bolt rotation between said activation position and said non-firing position is an angle between 10° and 20° from the bolt's fully closed position.  
   
   
       21 . A firearm comprising: 
 a barrel;    a barrel extension attached to said barrel, said barrel extension having a protrusion extending radially therefrom; and    a receiver, said receiver comprising: 
 a front, at least two sides, and a bottom;  
 a front recess to receive a barrel or barrel extension, said front recess defined by a channel in said receiver which is open longitudinally along a longitudinal slit in said receiver; and  
 a load/eject recess open to said front recess and to at least one side or said bottom of said receiver, said load/eject recess sized to allow the insertion and removal of a cartridge from said receiver;  
 said slit and said load/eject recess together forming a single opening to said receiver whereby said receiver can expand to allow the insertion of a barrel or barrel extension into said front recess;  
   whereby said slit accepts said protrusion to guide said barrel extension into said receiver.    
   
   
       22 . The firearm of  claim 21  further comprising a clamping hole in said receiver disposed through said longitudinal slit, said clamping hole sized to receive clamping means whereby said slit is compressible by said clamping means to apply a compressive force on said barrel extension.  
   
   
       23 . The firearm of  claim 22  wherein said clamping means is a bolt.  
   
   
       24 . The firearm of  claim 21  further comprising a safety mechanism, said safety mechanism comprising: 
 a bolt having: 
 a bolt head disposed at a distal end,  
 a proximal end, and  
 a longitudinal channel disposed in said bolt to house a firing pin;  
   a firing pin disposed in said longitudinal channel of said bolt, said firing pin having a distal end at said bolt head and a proximal end extending out of said longitudinal channel to allow activation of said firing pin by a hammer; and    a safety bar disposed at said proximal end of said firing pin wherein rotation of said bolt into a firing position rotates said safety bar into an activation position whereby said firing pin can be activated by a hammer striking said safety bar, and rotation of said bolt into a non-firing position rotates said safety bar out of said activation position whereby a falling hammer cannot strike said safety bar or firing pin.