US12339083 - Firearm, an upper receiver and a bolt carrier

This patent describes a firearm that includes a bolt carrier group, an upper receiver, and a magazine well designed to house cartridges, with a spring mechanism that facilitates the loading and unloading of cartridges. The upper receiver features two inclined contact surfaces that help center the bolt carrier group during operation, enhancing the firearm’s functionality.

Claim 1

1. A firearm, comprising: a bolt carrier group comprising a bolt carrier and a bolt, an upper receiver configured to carry the bolt carrier; a magazine well configured to receive a magazine; wherein the magazine is configured to house cartridges and comprise a spring exerting a force to the cartridges from the magazine towards the bolt carrier group; and a reverse movement of the bolt carrier group is configured to unload a used cartridge from the bolt and a forward movement of the bolt carrier group is configured to load a new cartridge from the magazine; and wherein the upper receiver comprises at least two receiver contact surfaces at a region defined by the bolt carrier group trajectory and the magazine well; a first receiver contact surface is at a first positive inclined angle against the force exerted by the spring, via the cartridge, to the bolt carrier group; a second receiver contact surface is at a second negative inclined angle against the force exerted by the spring, via the cartridge, to the bolt carrier group; the bolt carrier group comprises a first carrier contact surface configured to slide against the positively inclined first receiver contact surface and a second carrier contact surface configured to slide against the negatively inclined second receiver contact surface; wherein the force exerted by the spring is configured to push the bolt carrier group towards the at least two receiver contact surfaces and causes the bolt carrier group to center between the inclined angles defined by the first receiver contact surface and the second receiver contact surface. a bolt carrier group comprising a bolt carrier and a bolt, an upper receiver configured to carry the bolt carrier; a magazine well configured to receive a magazine; wherein the magazine is configured to house cartridges and comprise a spring exerting a force to the cartridges from the magazine towards the bolt carrier group; and a reverse movement of the bolt carrier group is configured to unload a used cartridge from the bolt and a forward movement of the bolt carrier group is configured to load a new cartridge from the magazine; and wherein the upper receiver comprises at least two receiver contact surfaces at a region defined by the bolt carrier group trajectory and the magazine well; a first receiver contact surface is at a first positive inclined angle against the force exerted by the spring, via the cartridge, to the bolt carrier group; a second receiver contact surface is at a second negative inclined angle against the force exerted by the spring, via the cartridge, to the bolt carrier group; the bolt carrier group comprises a first carrier contact surface configured to slide against the positively inclined first receiver contact surface and a second carrier contact surface configured to slide against the negatively inclined second receiver contact surface; wherein the force exerted by the spring is configured to push the bolt carrier group towards the at least two receiver contact surfaces and causes the bolt carrier group to center between the inclined angles defined by the first receiver contact surface and the second receiver contact surface.

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