Hardened receiver (Fallout 76)

The hardened reciever is a weapon mod for several weapons in Fallout 76, including the pipe gun.

Production
Pump-action shotgun:
 * 3 Adhesive
 * 2 Nuclear material
 * 3 oil
 * 4 screws
 * 4 springs
 * 10 steel

Location

 * Crafted at a weapons workbench.