Firearm with pressure relieving features

A firearm, comprising:

• a barrel assembly, comprising
• a barrel having a proximal end and a distal end comprising a muzzle of the barrel, the barrel having:
• a chamber defined in the proximal end of the barrel, the chamber having a distal end and a proximal end, and
• a bore extending distally from the distal end of the chamber, the bore defining a central axis of the barrel assembly, and
• a barrel extension coupled to the proximal end of the barrel,
• the barrel extension having a distal end and a proximal end, the barrel extension defining a bolt receiving recess in communication with the chamber,
• the barrel extension further having a barrel vent channel therein in communication with the bolt receiving recess, the barrel vent channel being defined in the barrel extension in a direction that is transverse to the central axis of the barrel assembly, the barrel assembly being configured to allow gasses associated with overpressure firing conditions to be directed through the barrel vent channel, the barrel extension further having barrel lugs in the proximal ends thereof, wherein the barrel vent channel is defined in the barrel extension at a position that is distal of the barrel lugs;
• and
• a bolt assembly, the bolt assembly having:
• a bolt having a distal end and a proximal end, the distal end having a bolt face formed thereon, and a sealing ring between the bolt face and the proximal end of the bolt.