Tapered barrel interface

Abstract

Assemblies, methods, and/or the like are provided. In some embodiments, a barrel assembly includes a barrel defining a bore extending therethrough between a receiver end of the barrel and a muzzle end of the barrel. In some embodiments, the barrel defines a threaded outer surface at the receiver end. In some embodiments, the barrel assembly includes a barrel extension defining a tapered outer surface and a threaded inner surface. In some embodiments, the threaded inner surface of the barrel extension is configured to engage the threaded outer surface of the barrel, the tapered outer surface of the barrel extension is configured to engage a tapered inner surface of an upper receiver.

1 . An improved upper receiver for a firearm, the upper receiver defining:
 an ejection port defined at a first side between a barrel end and a buttstock end; and   a barrel engagement portion defined at the barrel end,   wherein the barrel engagement portion defines:
 a threaded outer surface configured to engage a barrel nut; and 
 a tapered inner surface configured to engage a tapered outer surface of a barrel extension. 
   
     
     
         2 . The improved upper receiver for a firearm of  claim 1 , wherein the tapered inner surface comprises a frustoconical surface. 
     
     
         3 . The improved upper receiver for a firearm of  claim 1 , the improved upper receiver further defining a flat surface at the barrel end between the threaded outer surface and the tapered inner surface, wherein the flat surface is oriented perpendicular to an axis extending between the barrel end and the buttstock end. 
     
     
         4 . The improved upper receiver for a firearm of  claim 3 , wherein the flat surface is configured to abut a flange of the barrel extension when the barrel extension is configured in an installed position. 
     
     
         5 . The improved upper receiver for a firearm of  claim 1 , wherein the improved upper receiver further defines a slot formed in the barrel end between the threaded outer surface and the tapered inner surface. 
     
     
         6 . An improved firearm assembly comprising the improved upper receiver for a firearm of  claim 1  and a pin engaged with the improved upper receiver,
 wherein the improved upper receiver further defines:
 an opening disposed on a barrel end side of the ejection port; and 
 a bore, and 
 
 wherein the pin is installed in the opening and is configured to extend through the tapered inner surface into the bore. 
 
     
     
         7 . An improved barrel assembly comprising:
 a barrel defining a bore extending therethrough between a receiver end of the barrel and a muzzle end of the barrel,   wherein the barrel defines a threaded outer surface at the receiver end;   a barrel extension defining a tapered outer surface and a threaded inner surface,   wherein the threaded inner surface of the barrel extension is configured to engage the threaded outer surface of the barrel, and   wherein the tapered outer surface of the barrel extension is configured to engage a tapered inner surface of an upper receiver.   
     
     
         8 . The improved barrel assembly of  claim 7 , wherein the tapered outer surface of the barrel extension comprises a frustoconical surface. 
     
     
         9 . The improved barrel assembly of  claim 7 , further comprising a pin configured to engage the barrel extension between a receiver end of the barrel extension and a flange of the barrel extension. 
     
     
         10 . The improved barrel assembly of  claim 7 , further comprising a slot formed in a receiver end of the barrel extension between the threaded outer surface of the barrel extension and an inner bore of the barrel extension. 
     
     
         11 . An improved firearm assembly comprising the barrel assembly of  claim 7 , further comprising an upper receiver and a pin,
 wherein the upper receiver further defines:
 an opening disposed on a barrel end side of an ejection port; and 
 a bore, and 
   wherein the pin is installed in the opening and is configured to extend through the tapered inner surface of the upper receiver into the bore.   
     
     
         12 . An improved firearm assembly comprising:
 the upper receiver of  claim 1 ; and   a barrel assembly comprising:
 a barrel defining a bore extending therethrough between a receiver end of the barrel and a muzzle end of the barrel, wherein the barrel defines a threaded outer surface at the receiver end; and 
 the barrel extension defining the tapered outer surface and a threaded inner surface, wherein the threaded inner surface of the barrel extension is configured to engage the threaded outer surface of the barrel, and 
   wherein the tapered outer surface of the barrel extension is configured to engage the tapered inner surface of the upper receiver.   
     
     
         13 . An improved firearm comprising the improved firearm assembly of  claim 12 . 
     
     
         14 . The improved firearm assembly of  claim 12 , further comprising a pin configured to engage the barrel extension between a receiver end of the barrel extension and a flange of the barrel extension. 
     
     
         15 . The improved firearm assembly of  claim 12 , further comprising a slot formed in a receiver end of the barrel extension between the threaded outer surface of the barrel extension and an inner bore of the barrel extension. 
     
     
         16 . The improved firearm assembly of  claim 12 , wherein the improved upper receiver further defines a flat surface at the barrel end between the threaded outer surface and the tapered inner surface, wherein the flat surface is oriented perpendicular to an axis extending between the barrel end and the buttstock end. 
     
     
         17 . The improved firearm assembly of  claim 16 , wherein the flat surface is configured to abut a flange of the barrel extension in an installed position. 
     
     
         18 . A method of assembling an improved firearm, the improved firearm comprising:
 an improved upper receiver and a barrel assembly,   wherein the improved upper receiver defines:
 an ejection port defined at a first side between a barrel end and a buttstock end; 
 a barrel engagement portion defined at the barrel end, 
 wherein the barrel engagement portion defines:
 a threaded outer surface configured to engage a barrel nut; and 
 a tapered inner surface configured to engage a tapered outer surface of a barrel extension; and 
 
 a flat surface at the barrel end between the threaded outer surface and the tapered inner surface, wherein the flat surface is oriented perpendicular to an axis extending between the barrel end and the buttstock end, 
   wherein the barrel assembly comprises:
 a barrel defining a bore extending therethrough between a receiver end of the barrel and a muzzle end of the barrel, 
 wherein the barrel defines a threaded outer surface at the receiver end; and 
 a barrel extension defining a tapered outer surface and a threaded inner surface, 
 wherein the threaded inner surface of the barrel extension is configured to engage the threaded outer surface of the barrel, 
 wherein the tapered outer surface of the barrel extension is configured to engage a tapered inner surface of an upper receiver, and 
 wherein a gap is defined between a flange of the barrel extension and the flat surface of the upper receiver, 
   wherein the method comprises tightening the barrel nut until the gap is eliminated.   
     
     
         19 . The method of  claim 18 , wherein the improved upper receiver defines a slot formed in the barrel end between the threaded outer surface and the tapered inner surface and the barrel assembly further comprises a pin and the method further comprises sliding the barrel extension into the improved upper receiver until the pin and the slot engage to rotationally lock the barrel, the barrel extension, and the improved upper receiver. 
     
     
         20 . The method of  claim 19 , the method further comprising threading the barrel nut onto the improved upper receiver; and capturing the flange of the barrel extension.