December's Child

December's Child is a unique weapon featured in the Fallout 4 add-on Far Harbor.

Gameplay
December's Child is a unique combat rifle. It bears an equally unique M4 Carbine legendary effect that ostensibly (see notes) reduces the rifle's weight, converts its caliber to 5.56mm instead of the standard .45, and increases its firing rate by 25% and reload speed by 15%.

Variants

 * Combat rifle
 * Overseer's Guardian

Location
December's Child is found inside the Vim! Pop factory, in an area that DiMA used as a secret medical lab. He had an AI named KYE 1.1 guard his facility, and if Nick Valentine is currently accompanying the Sole Survivor, KYE 1.1 will recognize him as a synthetic prototype and let them enter. A medium speech check can be used to gain entrance without Nick being present. Regardless of the method used, December's Child is sitting beside the medical equipment at the back of the room.