Amazon.com : DD DAGGER DEFENSE- A Veteran Owned Company-DD119X Battle Flag Red Dot Reflex Sight Scope, Reflex Sight Optic (Not for Pistols) red dot Sight mil-spec 1913 Rail Mount only (Black) :
Newest addition to my Rival arsenal (and some updates to others) : r/Nerf
Blasters3d Micro Red Dot Sight Mark II PE for Nerf Rail - Etsy Singapore