Advanced receiver (Fallout 4)

An advanced receiver is a weapon mod for the .44 pistol, the 10mm pistol, the assault rifle, the combat shotgun, the double-barrel shotgun, the Deliverer and the lever-action rifle in Fallout 4.

Effects
An advanced receiver is the most powerful of the semiautomatic receiver mods you can build or acquire, offering across the board better performance than other such receivers. It offers a more sensitive trigger, improved rate of fire, and damage which is highest of the receivers available (before perks). However, it is generally the last one unlocked, or very rare to find.

Location
There is no fixed location for this mod, but you can buy a gun with this mod from some vendors in the game if you are a high enough level.