A handgun enables the adapter plate for mounting the dot-sight to be securely and easily assembled into the slide even without using a fastening member such as a screw. The handgun equipes with the adapter plate and the slide for mounting the dot-sight with the improved assembly structure, wherein the adapter plate slides toward one side and is assembled into the slide, and then a projection lever restricts sliding of the adapter plate in an opposite direction such that the adapter plate is not unintendedly detached from the slide.

An assembly comprising a firearm slide and an adaptor plate configured to mate with the firearm slide. The adapter plate includes a first seat in a top surface of the adaptor plate and a second seat in the top surface of the adaptor plate. The assembly also includes a first iron sight configured to mate with the first seat and a second iron sight configured to mate with the second seat.

An assembly comprising a firearm slide and an adaptor plate configured to mate with the firearm slide. The adapter plate includes a first seat in a top surface of the adaptor plate and a second seat in the top surface of the adaptor plate. The assembly also includes a first iron sight configured to mate with the first seat and a second iron sight configured to mate with the second seat.

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.

An alignment aid for a suppressor includes a sleeve having an external surface and an internal surface. An alignment slot extends longitudinally along the external surface of the sleeve. A groove is in the internal surface, and a strip is at least partially in the groove. A set screw is engaged with the strip to bias the strip radially inward from the groove.

An alignment aid for a suppressor includes a sleeve having an external surface and an internal surface. An alignment slot extends longitudinally along the external surface of the sleeve. A groove is in the internal surface, and a strip is at least partially in the groove. A set screw is engaged with the strip to bias the strip radially inward from the groove.

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.

A sighting apparatus for a firearm includes a front sight affixed to an upper surface at a front end of the firearm, and a rear sight affixed to the upper surface at an opposing rear end of the firearm. The rear sight includes a main body and an indexing element positioned thereon. The indexing element has its terminus aligned with the top surface of the rear sight body. The front sight is positioned higher than the rear sight, such that aiming the firearm involves pointing the front sight at the target, then aligning the bottom of the front site with the upper terminus of the indexing element on the rear sight. In one embodiment of the invention, the rear sight has a low-profile that enables the user to regain significant field of view that was blocked by prior art rear sights.

A firearm including a barrel, receiver, indirect gas system and an adjustable gas block designed to interface with the indirect gas system is provided. Four indexable positions of adjustment are provided for on the adjustable gas block. Positions of adjustment are selected based on the use of a silencer, use of under-powered ammunition, the presence of un-burnt powder and debris in the host firearms operating system, or if the weapon is being fired under ideal circumstances. The provided gas block is designed to function with an indirect gas operating system. Excess gas from the operating system is not vented from the gas block thereby generating excess flash and sound. No tool is required to manipulate the adjustment mechanism of the gas.

A firearm including a barrel, receiver, indirect gas system and an adjustable gas block designed to interface with the indirect gas system is provided. Four indexable positions of adjustment are provided for on the adjustable gas block. Positions of adjustment are selected based on the use of a silencer, use of under-powered ammunition, the presence of un-burnt powder and debris in the host firearms operating system, or if the weapon is being fired under ideal circumstances. The provided gas block is designed to function with an indirect gas operating system. Excess gas from the operating system is not vented from the gas block thereby generating excess flash and sound. No tool is required to manipulate the adjustment mechanism of the gas.