Abstract: A ground support tractor for providing ground support services at an airport. The ground support tractor has a cab forward configuration and a cab aft configuration. The ground support tractor includes a common chassis having a forward mounting location and an aft mounting location. A drivetrain and a battery system are coupled to the common chassis. In the cab forward configuration of the ground support tractor, the battery system is coupled to the aft mounting location and positioned above the drivetrain. In the cab aft configuration of the ground support tractor, the battery system is coupled to the forward mounting location and positioned forward of the drivetrain.

Abstract: A ground support tractor for providing ground support services at an airport. The ground support tractor has a cab forward configuration and a cab aft configuration. The ground support tractor includes a common chassis having a forward mounting location and an aft mounting location. A drivetrain and a battery system are coupled to the common chassis. In the cab forward configuration of the ground support tractor, the battery system is coupled to the aft mounting location and positioned above the drivetrain. In the cab aft configuration of the ground support tractor, the battery system is coupled to the forward mounting location and positioned forward of the drivetrain.

Abstract: A ground support tractor includes a wheeled chassis having a cabin mounted thereon. A door assembly is coupled to the cabin. The door assembly includes a lower track having a ramp and a door slidably received by the lower track and translatable in a first direction relative to the cabin between a closed position and an open position. The door includes a main panel and a closeout panel that is translatable relative to the main panel in a second direction between an extended position and a retracted position with the second direction being substantially normal to the first direction. The ramp is configured to apply a retraction force to the closeout panel that causes the closeout panel to translate from the extended position to the retracted position responsive to the door translating from the closed position to the open position.

Abstract: A ground support tractor for providing ground support services at an airport has a cab forward configuration and a cab aft configuration. The ground support tractor includes a common chassis having a forward mounting location and an aft mounting location. A seat assembly, a battery system and a plurality of body panels are coupled to the common chassis. In the cab forward configuration of the ground support tractor, the seat assembly is coupled to the forward mounting location, the battery system is coupled to the aft mounting location and the body panels are positioned in a cab forward orientation. In the cab aft configuration of the ground support tractor, the seat assembly is coupled to the aft mounting location, the battery system is coupled to the forward mounting location and the body panels are positioned in a cab aft orientation.

Abstract: A belt-fed weapon includes an upper part defining a feed tray cavity, and a feed tray in the feed tray cavity, wherein the feed tray and feed-tray cavity are co-configured for lateral sliding insertion and removal of the feed tray to and from an installed position in the feed tray cavity. The arrangement enables insertion and removal of the feed tray without interference with an installed scope or similar optic, enabling maintenance or field stripping without requiring removal or re-sighting of the scope.

Abstract: A feed tray assembly for a belt-fed weapon includes a bottom tray portion configured for mounting at a top of the weapon. The feed tray assembly further includes a feed tray cover mounted to the bottom tray portion and configured for lateral sliding opening and closing movement, such as on laterally extending pins riding in corresponding channels of the bottom tray portion. The feed tray cover has (1) a closed position in which it covers the bottom tray portion to retain the belt of ammunition during operation, and (2) an open position laterally displaced from the closed position to enable insertion of the belt of ammunition. Due to this lateral sliding movement of the feed tray cover, a sighting optic may be mounted on the weapon with a forward portion directly above the feed tray assembly without any undesired mechanical interference.

Abstract: A belt-fed weapon includes an upper part defining a feed tray cavity, and a feed tray in the feed tray cavity, wherein the feed tray and feed-tray cavity are co-configured for lateral sliding insertion and removal of the feed tray to and from an installed position in the feed tray cavity. The arrangement enables insertion and removal of the feed tray without interference with an installed scope or similar optic, enabling maintenance or field stripping without requiring removal or re-sighting of the scope.

Abstract: A firearm for firing cased telescoped (CT) ammunition cartridges that includes a split chamber configured to fully support a CT cartridge when it is fired, and that includes i) a dynamic rear chamber portion defining a pocket in a face of a bolt, and ii) a static front chamber portion that is integral to the barrel and separate from the bolt. A cartridge extraction mechanism engages the CT cartridge prior to the CT cartridge being fired, and holds the CT cartridge in the pocket in the bolt face as the bolt moves rearward to pull the CT cartridge out of the static front chamber portion and into an ejection position. An ejector is operable to eject the CT cartridge from the pocket in the face of the bolt when the CT cartridge reaches the ejection position.

Abstract: A feed tray assembly for a belt-fed weapon includes a bottom tray portion configured for mounting at a top of the weapon. The feed tray assembly further includes a feed tray cover mounted to the bottom tray portion and configured for lateral sliding opening and closing movement, such as on laterally extending pins riding in corresponding channels of the bottom tray portion. The feed tray cover has (1) a closed position in which it covers the bottom tray portion to retain the belt of ammunition during operation, and (2) an open position laterally displaced from the closed position to enable insertion of the belt of ammunition. Due to this lateral sliding movement of the feed tray cover, a sighting optic may be mounted on the weapon with a forward portion directly above the feed tray assembly without any undesired mechanical interference.

Abstract: A firearm for firing cased telescoped (CT) ammunition cartridges that includes a split chamber configured to fully support a CT cartridge when it is fired, and that includes i) a dynamic rear chamber portion defining a pocket in a face of a bolt, and ii) a static front chamber portion that is integral to the barrel and separate from the bolt. A cartridge extraction mechanism engages the CT cartridge prior to the CT cartridge being fired, and holds the CT cartridge in the pocket in the bolt face as the bolt moves rearward to pull the CT cartridge out of the static front chamber portion and into an ejection position. An ejector is operable to eject the CT cartridge from the pocket in the face of the bolt when the CT cartridge reaches the ejection position.

Abstract: A firearm for firing cased telescoped (CT) ammunition cartridges that includes a split chamber configured to fully support a CT cartridge when it is fired, and that includes i) a dynamic rear chamber portion defining a pocket in a face of a bolt, and ii) a static front chamber portion that is integral to the barrel and separate from the bolt. A cartridge extraction mechanism engages the CT cartridge prior to the CT cartridge being fired, and holds the CT cartridge in the pocket in the bolt face as the bolt moves rearward to pull the CT cartridge out of the static front chamber portion and into an ejection position. An ejector is operable to eject the CT cartridge from the pocket in the face of the bolt when the CT cartridge reaches the ejection position.

Abstract: A weapon for firing cased telescoped (CT) ammunition includes a barrel, a chamber member and a carrier assembly. The chamber member defines a chamber for a CT round for firing, and translates between a firing position aligned with the barrel and an ejection/loading position. The chamber member is spring-biased toward the firing position. Dual-feed structure provides for both a magazine mode as well as a belt feed mode of operation.

Abstract: A firearm for firing cased telescoped (CT) ammunition cartridges that includes a split chamber configured to fully support a CT cartridge when it is fired, and that includes i) a dynamic rear chamber portion defining a pocket in a face of a bolt, and ii) a static front chamber portion that is integral to the barrel and separate from the bolt. A cartridge extraction mechanism engages the CT cartridge prior to the CT cartridge being fired, and holds the CT cartridge in the pocket in the bolt face as the bolt moves rearward to pull the CT cartridge out of the static front chamber portion and into an ejection position. An ejector is operable to eject the CT cartridge from the pocket in the face of the bolt when the CT cartridge reaches the ejection position.

Abstract: A weapon for firing cased telescoped (CT) ammunition includes a barrel, a chamber member and a carrier assembly. The chamber member defines a chamber for a CT round for firing, and translates between a firing position aligned with the barrel and an ejection/loading position. The chamber member is spring-biased toward the firing position. Dual-feed structure provides for both a magazine mode as well as a belt feed mode of operation.

Abstract: A firearm for firing cased telescoped (CT) ammunition cartridges that includes a split chamber configured to fully support a CT cartridge when it is fired, and that includes i) a dynamic rear chamber portion defining a pocket in a face of a bolt, and ii) a static front chamber portion that is integral to the barrel and separate from the bolt. A cartridge extraction mechanism engages the CT cartridge prior to the CT cartridge being fired, and holds the CT cartridge in the pocket in the bolt face as the bolt moves rearward to pull the CT cartridge out of the static front chamber portion and into an ejection position. An ejector is operable to eject the CT cartridge from the pocket in the face of the bolt when the CT cartridge reaches the ejection position.

Abstract: A weapon for firing cased telescoped (CT) ammunition includes a barrel, a chamber member and a carrier assembly. The chamber member defines a chamber for a CT round for firing, and translates between a firing position aligned with the barrel and an ejection/loading position. The chamber member is spring-biased toward the firing position. The carrier assembly carries the firing pin and (1) performs a recoil in which a carrier and rammer move rearward from a battery position to bring the next CT round into a ramming position and to move the chamber member from the firing position to the ejection/loading position, and (2) performs a counter-recoil to return to the battery position and cause the rammer to push the next CT round into the chamber. The chamber member is released for biased return to the firing position for a next firing cycle.

Abstract: A weapon for firing cased telescoped (CT) ammunition includes a barrel, a chamber member and a carrier assembly. The chamber member defines a chamber for a CT round for firing, and translates between a firing position aligned with the barrel and an ejection/loading position. The chamber member is spring-biased toward the firing position. The carrier assembly carries the firing pin and (1) performs a recoil in which a carrier and rammer move rearward from a battery position to bring the next CT round into a ramming position and to move the chamber member from the firing position to the ejection/loading position, and (2) performs a counter-recoil to return to the battery position and cause the rammer to push the next CT round into the chamber. The chamber member is released for biased return to the firing position for a next firing cycle.

Abstract: A firearm for firing cased telescoped (CT) ammunition cartridges that includes a split chamber configured to fully support a CT cartridge when it is fired, and that includes i) a dynamic rear chamber portion defining a pocket in a face of a bolt, and ii) a static front chamber portion that is integral to the barrel and separate from the bolt. A cartridge extraction mechanism engages the CT cartridge prior to the CT cartridge being fired, and holds the CT cartridge in the pocket in the bolt face as the bolt moves rearward to pull the CT cartridge out of the static front chamber portion and into an ejection position. An ejector is operable to eject the CT cartridge from the pocket in the face of the bolt when the CT cartridge reaches the ejection position.

Abstract: A magazine for storing cased telescoped (CT) cartridges. The magazine includes vertically extending side-wall ribs that project inwards into a loading channel. The side-wall ribs are positioned in alignment with a circumferential groove in each CT cartridge. The side-wall ribs prevent a backwards oriented CT cartridge from being pushed from the loading position through the loading channel into a body of the magazine. A moveable lip at the top of the magazine may move out of the way when the magazine is attached to a firearm, to allow the CT cartridge located in the loading position to be fed vertically out of the top of magazine. Each CT cartridge may include a thermal protective insert that provides thermal insulation from heat emanating from a barrel of a firearm when the CT cartridge is located in a chamber of the firearm.