Understanding what a delta ring is can be important when working with a rifle. A delta ring is a type of ring found on most AR-15 and M16 rifles, and its purpose is to secure the barrel assembly to the rifle's upper receiver. This ring is constructed from high-strength steel, and is shaped like a triangle, giving it the name delta ring. The delta ring must be removed when changing out a barrel, so it's important for any rifle owner to understand how it works. To remove a delta ring, you must first remove the handguard by pressing the delta ring against the upper receiver and twisting counterclockwise until it releases from the barrel assembly. Once the handguard is free, you can then remove the delta ring itself by lifting it off the barrel nut. Knowing how to handle and remove a delta ring can be essential when performing maintenance on your rifle.