Rear sight block and barrel for a firearm

Abstract

A rear sight block/barrel assembly for an AK-47 rifle may include a bull barrel and a rear sight block. The bull barrel may include a first portion, a second portion having an outer diameter less than the first portion, and a third portion having an outer diameter less than the second portion. The bull barrel may include a right handed outer diameter threaded portion that extends from the distal end of the bull barrel. The rear sight block may include a body portion including a lower bore configured so the body portion is press fittable onto the second portion of the bull barrel. The body portion may further include a mount portion having a picatinny rail portion and a dovetail portion. The body portion may include a hole for receiving a pin insertable into the hole for securing the gas tube in position relative to the rear sight block.

What is claimed is: 
     
         1 . A rear sight block assembly for an AK-47 rifle, the rear sight block assembly comprising:
 a main body that includes:
 a lower bore having an inner diameter configured to press fit onto a AK-47 rifle barrel; and 
 an upper bore configured to receive a gas tube of a bolt carrier; and 
   a mounting member removably coupled to a top surface of the main body, the mounting member including:
 a first mounting platform that is coupleable with a first rifle accessory in a first manner; and 
 a second mounting platform that is different than the first mounting platform and that is coupleable with a second rifle accessory in a second manner, the second manner being different than the first manner. 
   
     
     
         2 . The rear sight block assembly of  claim 1 , wherein the mounting member is a single component that includes a Picatinny rail and a dovetail. 
     
     
         3 . The rear sight block assembly of  claim 1 , further comprising a hole in an upper front portion of the main body, the hole being configured to receive a gas tube latch pin to secure the gas tube in position relative to the main body. 
     
     
         4 . The rear sight block assembly of  claim 3 , further comprising a pair of fasteners, wherein each fastener is configured to couple with an end of the gas tube latch pin to secure the gas tube latch pin within the hole of the main body. 
     
     
         5 . The rear sight block assembly of  claim 3 , wherein the gas tube latch pin has at least one threaded end. 
     
     
         6 . The rear sight block assembly of  claim 1 , wherein the first manner includes inserting or sliding the accessory laterally into the first mounting platform. 
     
     
         7 . The rear sight block assembly of  claim 1 , wherein the second manner includes inserting or clipping the accessory over the second mounting platform. 
     
     
         8 . The rear sight block assembly of  claim 1 , the main body portion further comprising at least one protrusion in an upper rear portion of the main body wherein the at least one protrusion couples and locks a dust cover over a receiver assembly of the AK-47 rifle. 
     
     
         9 . The rear sight block assembly of  claim 1 , the main body portion further comprising a horse-shoe shaped recess in a rear portion of the main body configured to provide clearance for the rear sight block to fit over a front trunnion. 
     
     
         10 . The rear sight block assembly of  claim 2 , further comprising an iron sight attached to the dovetail of the mounting member. 
     
     
         11 . The rear sight block assembly of  claim 10 , further comprising a fastener for providing elevation adjustment for the iron sight and another fastener for providing windage adjustment for the iron sight. 
     
     
         12 . The rear sight block assembly of  claim 2 , wherein the dovetail portion includes a tapered slot for mounting an accessory. 
     
     
         13 . The rear sight block assembly of  claim 2 , wherein the Picatinny portion includes a plurality of rectangular slots for mounting an accessory. 
     
     
         14 . A rear sight block for an AK-47 rifle, the assembly comprising:
 a rear sight block having:
 a body portion including a lower bore having an inner diameter that is configured so the body portion is press fittable onto an AK-47 bull barrel, the body portion further including an upper bore configured to receive a gas tube of a bolt carrier; 
 a mount portion removably coupled to a top surface of the body portion, the mount portion including a Picatinny rail portion and a dovetail portion; and 
 a hole in the upper front body portion for receiving a pin, the pin insertable into the hole for securing the gas tube in position relative to the rear sight block, the pin having at least one threaded end. 
   
     
     
         15 . The rear sight block of  claim 14 , wherein the mount portion including the Picatinny rail portion and the dovetail portion is a single component. 
     
     
         16 . The rear sight block of  claim 14 , further comprising an iron sight that is coupled with the dovetail of the mount portion. 
     
     
         17 . The rear sight block of  claim 14 , wherein the mount portion is attachable to a plurality of accessories, the plurality of accessories includes an iron sight, laser sights, scope mount, red dot, or combinations thereof. 
     
     
         18 . A barrel assembly for an AK-47 rifle, the barrel assembly comprising: the rear sight block of  claim 14 , and an AK-47 bull barrel press fitted onto the body portion of the rear sight block. 
     
     
         19 . The barrel assembly of  claim 18 , wherein the AK-47 bull barrel includes a first step down in diameter from an AK-47 rifle coupling portion to a sight block coupling portion and a second step down in diameter from the sight block coupling portion to a main barrel portion, and wherein the rear sight block body portion lower bore is press fittable onto the sight block coupling portion. 
     
     
         20 . The barrel assembly of  claim 19 , wherein the AK-47 bull barrel has at most the first step down and the second step down, and the AK-47 bull barrel is devoid of further step downs in diameter.