Firearm gas block

Abstract

A gas block for a firearm and a gas block system for a firearm. The gas block includes an upper tube connected to a lower tube. The upper tube includes a first passageway and an aperture through the upper tube opposite the lower tube. The lower tube includes a second passageway configured to receive a barrel of a firearm. A central passageway connects the first passageway to the second passageway. A gas nipple having a central bore is threaded into the central passageway. The gas nipple includes an engagement feature to engage a tool for the rotation of the gas nipple within the central passageway. The tool may be inserted through the aperture in the upper tube. The gas nipple may include a taper at the second end. The first passageway is configured to receive a gas tube, or a piston cup, and the second passageway receives a firearm barrel.

What is claimed is: 
     
         1 . A gas block for a firearm, the gas block comprising:
 an upper tube having a first passageway and an aperture through the upper tube to the first passageway;   a lower tube having a second passageway, the lower tube being connected to the upper tube, wherein the aperture through the upper tube is opposite the lower tube and wherein the second passageway is configured to receive a barrel of a firearm;   a central passageway that connects the first passageway to the second passageway; and   a gas nipple positioned in the central passageway, the gas nipple having a first end, a second end, exterior threads, a central bore that extends from the first end to the second end, and an engagement feature on the first end, wherein the engagement feature is configured to engage a tool for the rotation of the gas nipple within the central passageway.   
     
     
         2 . The gas block of  claim 1 , wherein the gas nipple includes a taper at the second end. 
     
     
         3 . The gas block of  claim 1 , wherein the first passageway is configured to receive a gas tube or a piston cup. 
     
     
         4 . A gas block system for a firearm, the gas block system comprising:
 an upper tube having a first passageway and a first aperture through the upper tube to the first passageway;   a lower tube having a second passageway, the lower tube being connected to the upper tube;   a central passageway that connects the first passageway to the second passageway;   a gas nipple positioned in the central passageway, the gas nipple having a first end, a second end, exterior threads, a central bore that extends from the first end to the second end, and an engagement feature on the first end;   a gas tube having a first end and a second end, the first end of the gas tube being open to an interior and the second end of the gas tube being close, the gas tube including a second aperture through the gas tube;   wherein the gas tube is positioned within the first passageway; and   wherein the second aperture is aligned with the central bore of the gas nipple.   
     
     
         5 . The system of  claim 4 , wherein the engagement feature is configured to engage a tool for the rotation of the gas nipple within the central passageway. 
     
     
         6 . The system of  claim 5 , further comprising a firearm barrel positioned within the second passageway, the firearm barrel comprising a projectile path and a third aperture through the firearm barrel in communication with the projectile path, wherein the third aperture is aligned with the central bore of the gas nipple and the second aperture to provide communication between the projectile path and the interior of the gas tube. 
     
     
         7 . The system of  claim 6 , wherein the exterior threads of the gas nipple are threaded into the gas block to the firearm barrel. 
     
     
         8 . The system of  claim 7 , wherein the gas nipple includes a taper at the second end 
     
     
         9 . The system of  claim 8 , wherein the taper at the second end of the gas nipple mates with a corresponding structure on the firearm barrel. 
     
     
         10 . The system of  claim 9 , wherein a seal is created between the taper and the corresponding structure on the firearm barrel. 
     
     
         11 . The system of  claim 10 , wherein the central bore of the gas nipple has a larger diameter than the third aperture through the firearm barrel. 
     
     
         12 . The system of  claim 11 , wherein a portion of the gas nipple extends into the third aperture through the firearm barrel to prevent the rotation of the upper tube and the lower tube with respect to the firearm barrel.