Abstract: A magazine is provided for a firearm. The magazine comprises a locking mechanism. The locking mechanism has a user interface adapted to enable a user to select between a locked condition and an unlocked condition. The locking mechanism has a rotor movable between a first rotational position when the locking mechanism is in the locked condition and a second rotational position when the locking mechanism is in the unlocked condition. The magazine comprises an elongated shaft connected to the rotor. The magazine comprises a block element connected to the elongated shaft. The block element is adapted to move between a first position when the locking mechanism is in the locked condition in which at least one of firearm operation and magazine extraction are prevented, and a second position when the locking mechanism is in the unlocked condition in which firearm operation and magazine extraction are enabled.

Abstract: Mid lock-up receivers have an elongated body, the body defining a passage, the body having a first rear portion and a second forward portion adjacent to and forward of the rear portion, the first rear portion defining a first passage segment having a first diameter and the second forward portion defining a second passage segment having a second diameter greater than the first diameter, a stop surface defined at a forward end of the first rear portion, an elongated sleeve defining a sleeve passage and received in the second passage segment, the sleeve having a rear-facing limit surface spaced apart from the stop surface, and the sleeve being compressively received in the body wherein the body is in tension about the sleeve, and the sleeve is compressed by the body. The sleeve may be thermally bonded to the body.

Abstract: A magazine is provided for a firearm. The magazine comprises a locking mechanism. The locking mechanism has a user interface adapted to enable a user to select between a locked condition and an unlocked condition. The locking mechanism has a rotor movable between a first rotational position when the locking mechanism is in the locked condition and a second rotational position when the locking mechanism is in the unlocked condition. The magazine comprises an elongated shaft connected to the rotor. The magazine comprises a block element connected to the elongated shaft. The block element is adapted to move between a first position when the locking mechanism is in the locked condition in which at least one of firearm operation and magazine extraction are prevented, and a second position when the locking mechanism is in the unlocked condition in which firearm operation and magazine extraction are enabled.

Abstract: Mid lock-up receivers have an elongated body, the body defining a passage, the body having a first rear portion and a second forward portion adjacent to and forward of the rear portion, the first rear portion defining a first passage segment having a first diameter and the second forward portion defining a second passage segment having a second diameter greater than the first diameter, a stop surface defined at a forward end of the first rear portion, an elongated sleeve defining a sleeve passage and received in the second passage segment, the sleeve having a rear-facing limit surface spaced apart from the stop surface, and the sleeve being compressively received in the body wherein the body is in tension about the sleeve, and the sleeve is compressed by the body. The sleeve may be thermally bonded to the body.

Abstract: A magazine is provided for a firearm. The magazine comprises a locking mechanism. The locking mechanism has a user interface adapted to enable a user to select between a locked condition and an unlocked condition. The locking mechanism has a rotor movable between a first rotational position when the locking mechanism is in the locked condition and a second rotational position when the locking mechanism is in the unlocked condition. The magazine comprises an elongated shaft connected to the rotor. The magazine comprises a block element connected to the elongated shaft. The block element is adapted to move between a first position when the locking mechanism is in the locked condition in which at least one of firearm operation and magazine extraction are prevented, and a second position when the locking mechanism is in the unlocked condition in which firearm operation and magazine extraction are enabled.

Abstract: Ammunition magazines have a lower magazine body having a body profile adapted to be closely received in the magazine well, the lower magazine body having an elongated upper surface, a magazine tower protruding above the upper surface and having a free upper end defining an ammunition exit aperture, an ammunition receptacle passage registered with the magazine tower, the magazine tower having a limited tower profile smaller than the body profile and adapted to be closely received in the magazine aperture, the magazine body having a front surface defining a vertical plane of reference, and the magazine tower having a front surface angled rearwardly with respect to the vertical plane of reference. The magazine tower may be tapered. The magazine tower may have a greater length adjacent to the body elongated upper surface than at the free upper end.

Abstract: Mid lock-up receivers have an elongated body, the body defining a passage, the body having a first rear portion and a second forward portion adjacent to and forward of the rear portion, the first rear portion defining a first passage segment having a first diameter and the second forward portion defining a second passage segment having a second diameter greater than the first diameter, a stop surface defined at a forward end of the first rear portion, an elongated sleeve defining a sleeve passage and received in the second passage segment, the sleeve having a rear-facing limit surface spaced apart from the stop surface, and the sleeve being compressively received in the body wherein the body is in tension about the sleeve, and the sleeve is compressed by the body. The sleeve may be thermally bonded to the body.

Abstract: Mid lock-up receivers have an elongated cylindrical body, the body defining a passage, the body having a first rear portion and a second forward portion adjacent to and forward of the rear portion, the first rear portion defining a first passage segment having a first diameter and the second forward portion defining a second passage segment having a second diameter greater than the first diameter, a forward facing step surface defined at a forward face of the first rear portion, an elongated cylindrical sleeve defining a sleeve passage and received in the second passage segment, the sleeve having a rear end spaced apart from the step surface, and the sleeve being compressively received in the body wherein the body is in tension about the sleeve, and the sleeve is compressed by the body. The sleeve may be thermally bonded to the body.

Abstract: Mid lock-up receivers have an elongated cylindrical body, the body defining a passage, the body having a first rear portion and a second forward portion adjacent to and forward of the rear portion, the first rear portion defining a first passage segment having a first diameter and the second forward portion defining a second passage segment having a second diameter greater than the first diameter, a forward facing step surface defined at a forward face of the first rear portion, an elongated cylindrical sleeve defining a sleeve passage and received in the second passage segment, the sleeve having a rear end spaced apart from the step surface, and the sleeve being compressively received in the body wherein the body is in tension about the sleeve, and the sleeve is compressed by the body. The sleeve may be thermally bonded to the body.

Abstract: An apparatus and method for suppressing the muzzle gases from a firearm are disclosed. The suppressor includes a shell and a core, the core having a body with first and second stages. The diameter of the first stage is larger than the diameter of the second stage. In some embodiments, the first and second stages of the core body include hollow chambers defined by baffles. The hollow chambers may have a serpentine arrangement.

Abstract: An apparatus and method for suppressing the muzzle gases from a firearm are disclosed. The suppressor includes a shell and a core, the core having a body with first and second stages. The diameter of the first stage is larger than the diameter of the second stage. In some embodiments, the first and second stages of the core body include hollow chambers defined by baffles. The hollow chambers may have a serpentine arrangement.

Abstract: Firearms include some components originally configured for use with centerfire cartridge ammunition, such as a lower portion, and other components configured for use with rimfire cartridges, such as an upper portion and magazine. The firearm is thus configured for firing rimfire cartridge ammunition, although some components of the firearm may be characterized as centerfire firearm components. Methods of fabricating firearms involve assembly of a rimfire upper portion with a centerfire lower portion. A magazine is provided that is configured to couple to the centerfire lower portion, and to feed rimfire cartridges from within the magazine into the rimfire upper portion. Methods of adapting a centerfire firearm for use with rimfire cartridges involve removal of a centerfire barrel and upper portion from a centerfire lower portion, and attachment of a second upper portion and a second barrel, each configured for use with rimfire cartridge ammunition, to the centerfire lower portion.

Abstract: According to a preferred aspect of the instant invention, there is provided herein a system and method for using both a temporal zone of seismic data and conditioned amplitude spectra thereof to determine the underlying layer sequence. The instant invention is suitable both for determining layer positions and layer impedance magnitudes, that best describes the geologic sequence sampled by a band limited seismic source wavelet as reflected from the zone.