Even the 870 has naught but bead and blade sights, it's a hunting/skeet shotgun, why would it have a ring?
Excerpt from Wikipedia:
Remington 870 article:
Sights: Bead, twin bead, adjustable open sights, or
ghost ring (all iron sights). Also cantilever and receiver-mounts for scopes.
In addition:
The Remington Model 870 is a U.S.-made pump-action shotgun manufactured by Remington Arms Company, Inc. It is widely used by the public for sport shooting, hunting, and
self-defense. It is also commonly used by
law enforcement and
military organizations worldwide.
Someone needs to brush up on their firearm know-how.