It's never wrong to have a set of good flip up sights on your airsoft gun in case the battery of your reddot is dead.
These kind of sights make sure that even though your reddot has failed for whatever reason, you can still keep aiming. That's why they are often called back up sights. Most of them come in the variant Flip-Up-Sights but you can also choose for example Offset or Canted Iron Sights.
