I' recompiled this shotgun with recolored Milenia textures and pistol grip I made. I think it looks pretty well this way. Sorry, I forgot where I found sounds ... If somebody knows, please, tell me to credit the creator of sounds.
The single shot firing and pump action sounds are by xLongWayHome and the double firing is a sound included default HL2. I think it only appears once ingame in a scripted event with Father Grigori and his Annabelle.