A hammer block for a firearm is disclosed. The firearm includes a firing pin and a hammer. The hammer is pivotally attached to a hammer pin within a trigger house of a lower receiver. The hammer block includes a body comprising an upper portion and a lower portion. The hammer block also includes a central gap forming two downwardly facing legs in the lower portion of the body. The body is positioned within the trigger housing in front of the hammer with the two downwardly facing legs positioned on the sides of the hammer and the central gap positioned over the hammer so that the hammer rotates into the body and is prevented from engaging the firing pin.

A mount for a firearm has a body having a first clamp configured to engage a first edge of the rail, a jaw movably connected to the body and having a second clamp opposed to the first clamp and operable with the respective clamps to engage respective opposed lateral edges of the rail, a spring biasing the jaw toward the body, and at least a portion of the spring being between the clamps. There may be a pushrod connected to a first one of the body and the jaw and slidably received by the other of the body and the jaw. The spring may be laterally positioned to one side of the pushrod. The spring may be a coil spring having a spring axis offset from a pushrod axis defined by the pushrod.

Trigger groups for semi-automatic firearms have a hammer, a trigger element, a sear, a selector, and a disconnector assembly, the disconnector assembly operable when the selector is in a first position to retain the hammer in the cocked position in response to release of the trigger element to the rest position subsequent to discharge of the firearm by pulling the trigger element, and the disconnector assembly operable when the selector is in a second position to release the hammer to the striking position in response to release of the trigger element to the rest position subsequent to discharge of the firearm by pulling the trigger element, such that the firearm discharges once per cycle of the trigger element when the selector is in the first position, and fires once for each forward or rearward motion of the trigger element when the selector is in the second position.

Trigger groups for semi-automatic firearms have a hammer, a trigger element, a sear, a selector, and a disconnector assembly, the disconnector assembly operable when the selector is in a first position to retain the hammer in the cocked position in response to release of the trigger element to the rest position subsequent to discharge of the firearm by pulling the trigger element, and the disconnector assembly operable when the selector is in a second position to release the hammer to the striking position in response to release of the trigger element to the rest position subsequent to discharge of the firearm by pulling the trigger element, such that the firearm discharges once per cycle of the trigger element when the selector is in the first position, and fires once for each forward or rearward motion of the trigger element when the selector is in the second position.

A trigger assembly improved, having a trigger assembly with first and second shroud side edges that define an angled face. The angled face tapers and is sufficiently wide to partially cover a trigger spring to reduce debris accumulation thereon. First and second housing sidewalls are countersunk and have at least one debris hole. A disconnector assembly has first and second disconnector side faces that define a spring well to house a disconnector spring. The disconnector assembly further has a disconnector shroud and disconnector shroud top face that are sufficiently wide to cover the spring well and the disconnector spring. A hammer assembly has first and second hammer spring mounts to secure a hammer spring. First, second, third and fourth hammer spring shrouds are sufficiently wide to partially cover the hammer spring. The hammer assembly further has first and second debris bevels that extend to first and second hammer sidewalls respectively.

Provided in various example embodiments is a firing mechanism for firearms including a trigger with a movable sear attached to the trigger. When dimensional interference occurs within the trigger group, the movable sear is displaced from a seated position to an unseated position, instead of moving the trigger out of the non-firing position. This allows a firearm to be cocked when the trigger is locked in safe mode, and allows a firearm to be placed into safe mode at any time, regardless of the position of the hammer. This functionality improves the effectiveness of automatic trigger locking mechanisms discussed in related applications, and may be applied in various forms to firearms generally.

Trigger groups for semi-automatic firearms have a frame, a hammer connected to the frame and movable between a cocked position and a striking position, the hammer being biased toward the striking position, a trigger element connected to the frame and movable by a user between a forward position and a rearward position, a selector connected to the frame and movable between at least a first position and a second position, a disconnector having a hammer engagement facility adapted to selectably engage the hammer, a disconnector control element movable between a first control position and a second control position, the disconnector being operably engaged to the disconnector control element, the disconnector operable to move in a first range of motion when the disconnector control element is in the first control position, and in a second range of motion when the disconnector control element is in the second control position.

Trigger groups for semi-automatic firearms have a frame, a hammer connected to the frame and movable between a cocked position and a striking position, the hammer being biased toward the striking position, a trigger element connected to the frame and movable by a user between a forward position and a rearward position, a selector connected to the frame and movable between at least a first position and a second position, a disconnector having a hammer engagement facility adapted to selectably engage the hammer, a disconnector control element movable between a first control position and a second control position, the disconnector being operably engaged to the disconnector control element, the disconnector operable to move in a first range of motion when the disconnector control element is in the first control position, and in a second range of motion when the disconnector control element is in the second control position.

In some embodiments, a firearm trigger assembly comprises a hammer arranged to pivot on a hammer axis. The hammer comprises a cavity offset from the hammer axis, and the cavity has an opening that extends along a length of the cavity. A secondary biasing mechanism comprises a support member and a biasing member. The support member comprises a first portion oriented in the cavity and a second portion arranged to support the biasing member. The first portion is fixedly attached to the second portion. The trigger assembly has a first orientation and a second orientation. The secondary biasing mechanism biases the hammer in a first direction about the hammer axis in the first orientation, and in a second direction about the hammer axis in the second orientation.

In some embodiments, a firearm trigger assembly comprises a hammer arranged to pivot on a hammer axis. The hammer comprises a cavity offset from the hammer axis, and the cavity has an opening that extends along a length of the cavity. A secondary biasing mechanism comprises a support member and a biasing member. The support member comprises a first portion oriented in the cavity and a second portion arranged to support the biasing member. The first portion is fixedly attached to the second portion. The trigger assembly has a first orientation and a second orientation. The secondary biasing mechanism biases the hammer in a first direction about the hammer axis in the first orientation, and in a second direction about the hammer axis in the second orientation.