Bolt carrier group for direct gas impingement system

A bolt carrier group for a weapon system, comprising:

• a carrier assembly comprising a carrier body, the carrier body comprising:
• a shoulder disposed within the carrier body and containing a channel therethrough;
• a piston surface located on the shoulder at least partially encompassing the channel in the shoulder;
• and
• an inlet port extending through the carrier body and configured for receiving propellant gases into the carrier body;
• a bolt assembly at least partially contained within the carrier assembly, the bolt assembly comprising a bolt head opposite of a bolt tail, a bolt body disposed between the bolt head and the bolt tail, the diameter of the bolt tail is smaller than the diameter of the bolt body, the bolt tail is axially aligned with the bolt body, and the bolt tail at least partially protruding into the channel in the shoulder;
• and
• a gas chamber disposed between the carrier body, the piston surface, the bolt tail, and two gas seals disposed on the bolt assembly, wherein:
• the two gas seals comprise a forward gas seal and a rear gas seal,
• the forward gas seal is contained on a gas collar disposed on the bolt body,
• the forward gas seal comprises a forward chamber surface area,
• the rear gas seal is contained on the bolt tail, and
• the piston surface area is about 98% or less of the forward chamber surface area.

An upper receiver assembly for a weapon system, comprising:

• an upper receiver comprising a barrel;
• a gas block fluidly coupled to the barrel;
• and
• a bolt carrier group fluidly coupled to the gas block, wherein the bolt carrier group comprises:
• a carrier assembly comprising a carrier body, the carrier body comprising:
• a shoulder disposed within the carrier body and containing a channel therethrough;
• a piston surface located on the shoulder at least partially encompassing the channel in the shoulder;
• an inlet port extending through the carrier body and configured for receiving propellant gases into the carrier body;
• and
• an exhaust port extending through the carrier body and configured for removing the propellant gases from the carrier body;
• a bolt assembly at least partially contained within the carrier assembly, the bolt assembly comprising a bolt head opposite of a bolt tail, a bolt body disposed between the bolt head and the bolt tail, the diameter of the bolt tail is smaller than the diameter of the bolt body, the bolt tail is axially aligned with the bolt body, and the bolt tail at least partially protruding into the channel in the shoulder, and wherein a forward gas seal is contained on a gas collar disposed on the bolt body and a rear gas seal is contained on the bolt tail;
• and
• a gas chamber disposed between the carrier body, the piston surface, the bolt tail, the forward gas seal, and the rear gas seal.