Angel-Killing Gun

The Angel-Killing Gun, or Crowley's gun, is a gun that Crowley himself made by melting angel blade material into bullets. It can be used to kill angels, demons, and any other supernatural creature that the angel blade can.

Overview
It is first created by Crowley after several losing streaks against the Sam and Dean and Naomi. Crowley uses the gun along with the angel bullets to kill Esper and wound Ion. He attempts to shoot Naomi but she escapes immediately after. It is seen to be able to not only kill, but also wound, as to slow down the victim.