Barrel alignment and locking assembly

A firearm, comprising:

• a receiver defining a barrel receiving recess;
• an alignment tab coupled to the receiver, the alignment tab including an engagement surface, and a partial feed ramp extending proximally from the engagement surface;
• and
• a barrel extension including a distal end and a proximal end, the proximal end defining a slot configured to matingly receive the engagement surface when the barrel extension is positioned in the barrel receiving recess to align and orient the barrel extension relative to the receiver.

A firearm, comprising:

• a receiver formed a first material, the receiver defining a barrel receiving recess;
• an alignment tab formed from a second material, the second material being harder than the first material, wherein the alignment tab includes an engagement surface, and a feed ramp extending proximally from the engagement surface;
• and
• a barrel extension including a distal end and a proximal end, the proximal end defining a slot configured to receive the engagement surface, wherein the alignment tab is coupled to the receiver and is further configured to align the barrel extension to the receiver when the slot abuts the engagement surface.