A bolt action rifle having a receiver; a bolt in slidable communication within said receiver, having an elongated body and a bolt head at a first end, and an exposed bolt face with a primer recess cavity having a base with a forward-facing surface, the base having an aperture therein, where the aperture is circumscribed by the forward-facing surface for receiving a propellant charge having an extended primer cap, and a firing pin within the bolt and movable between a disengaged position wherein a firing pin head is receded within the aperture and an engaged position wherein the firing pin head extends beyond the forward-facing surface into the primer recess cavity.

The present disclosure is directed to firearms that can receive and fire bullets from ammunition with different cartridge case sizes. For example, the receiver may fire a bullet from either a short cartridge, a medium cartridge, or long cartridge after the short, medium, or long cartridge is received by a receiver of the firearm. This firearm may include a receiver portion and a bolt portion that lock together at different relative locations when cartridges of different lengths are received by the receiver portion. The receiver portion may include a first type of alignment retention features (e.g. protrusions) and the bolt portion may include a second type of alignment retention features (e.g. recessions). Once a firearm cartridge is located inside of the firearm, it may be fired based on the receiver and the bolt portions being locked together via physical engagement of the different types of alignment retention features.

The present disclosure is directed to firearms that can receive and fire bullets from ammunition with different cartridge case sizes. For example, the receiver may fire a bullet from either a short cartridge, a medium cartridge, or long cartridge after the short, medium, or long cartridge is received by a receiver of the firearm. This firearm may include a receiver portion and a bolt portion that lock together at different relative locations when cartridges of different lengths are received by the receiver portion. The receiver portion may include a first type of alignment retention features (e.g. protrusions) and the bolt portion may include a second type of alignment retention features (e.g. recessions). Once a firearm cartridge is located inside of the firearm, it may be fired based on the receiver and the bolt portions being locked together via physical engagement of the different types of alignment retention features.

A gun-type firing device using a caseless projectile is disclosed. The caseless projectile has a bullet head and an impact seat at two ends thereof and a groove adjacent to the impact seat. The gun-type firing device includes a gunstock, a gun bolt and a gun barrel. The gun bolt is located on one side of the gunstock. The gun bolt includes a cocking handle and an extractor. The cocking handle can perform a linear displacement movement along the extension direction of the gunstock. The extractor is located at one end of the cocking handle. The gun barrel is located on the gunstock and is adjacent to one end of the gun bolt. The gun barrel does not have rifling.

A rotating gun bolt assembly includes a main body subassembly and a head subassembly. The main body subassembly including a helical receiving pocket. The head subassembly includes a head end and a rear end. The rear end of the head subassembly includes a helical tang extending from the rear end and mated with the helical receiving pocket in the main body subassembly. The helical tang includes a straight side, a distal edge and a helical side. The straight side extends perpendicular from the rear end of the head subassembly. The distal edge extends perpendicular to the straight side, where the distal edge is parallel with the rear end of the head subassembly. The helical side extends helically from the rear end of the head subassembly to the distal edge of the helical tang.

A firearm safety round configured to function as a safety round for the following firearms: SAR 21—Singapore Assault Rifle-21st Century and M-16 rifle. The safety round includes a cylindrical rear end having a rim, a mid-section adjacent the rear end opposite the rim, the mid-section comprises a truncated cylinder having opposite flat sides, a tab extending outwardly from the mid-section and configured so that when the safety round is received by the firing chamber, the tab will extend out of the firing chamber to visually indicate that the firing chamber of the firearm is free of live ammunition and a cylindrical nose portion extending from the mid-section, opposite from the rear end and longitudinally aligned therewith. When the safety round is installed in the firing chamber of the firearm, one of the flat sides rests on the firing chamber and positions the rim in alignment with the extractor, and the flat sides configure the mid-section so that a largest dimension of the mid-section is smaller than a height of the extraction port of the firearm.

A firearm safety round configured to function as a safety round for the following firearms: SAR 21—Singapore Assault Rifle-21st Century and M-16 rifle. The safety round includes a cylindrical rear end having a rim, a mid-section adjacent the rear end opposite the rim, the mid-section comprises a truncated cylinder having opposite flat sides, a tab extending outwardly from the mid-section and configured so that when the safety round is received by the firing chamber, the tab will extend out of the firing chamber to visually indicate that the firing chamber of the firearm is free of live ammunition and a cylindrical nose portion extending from the mid-section, opposite from the rear end and longitudinally aligned therewith. When the safety round is installed in the firing chamber of the firearm, one of the flat sides rests on the firing chamber and positions the rim in alignment with the extractor, and the flat sides configure the mid-section so that a largest dimension of the mid-section is smaller than a height of the extraction port of the firearm.

Apparatus, systems, and methods for the maintenance, repair, modification, cleaning, disassembly, and reassembly of firearms and firearm components are disclosed. Particular embodiments include tools to aid in the removal and insertion of an extractor pin from the bolt assembly of an AR-15 or M-16 rifle. Preferred embodiments are directed to bolt assemblies for .223 and .308 imperial caliber firearms, as well as 5.56 and 7.62 metric caliber firearms. The tools include a housing with a channel to receive the bolt, a channel to insert a locking rod to orient and secure the bolt in the housing, a channel for inserting a removal rod to remove the extractor pin from the bolt or an inserting rod to insert the extractor pin into the bolt.

Apparatus, systems, and methods for the maintenance, repair, modification, cleaning, disassembly, and reassembly of firearms and firearm components are disclosed. Particular embodiments include tools to aid in the removal and insertion of an extractor pin from the bolt assembly of an AR-15 or M-16 rifle. Preferred embodiments are directed to bolt assemblies for .223 and .308 imperial caliber firearms, as well as 5.56 and 7.62 metric caliber firearms. The tools include a housing with a channel to receive the bolt, a channel to insert a locking rod to orient and secure the bolt in the housing, a channel for inserting a removal rod to remove the extractor pin from the bolt or an inserting rod to insert the extractor pin into the bolt.

A bolt mechanism for gas operated auto-cycling firearms is provided with a spring urged ejector having a geometry that provides a dead stop to limit excessive ejector movement and force that might otherwise damage or cause excessive wear of the ejector. The bolt member defines an ejector receptacle having an enlarged receptacle portion of oval configuration having the radial width of a standard ejector and defining an internal dead stop shoulder. The ejector member has limited linear movement within its receptacle and has a corresponding stop shoulder that is positioned for engagement with the internal stop shoulder and serves to positively stop ejector movement if the ejector is subjected to excessive force.