Just a bead for me, thanks. With a shotgun at close range, the comb of the stock is my rear sight. Focus on the target and swing to it as needed. When the blur/flash of the bead covers the target, shoot.
The only extra gear to consider is a light, per posters above.
The United States Marine Corps: Providing the enemies of America the opportunity to die for their countries since 1775. Semper fi.