TechGearLab

The Nerf Longstrike Modulus has a very inventive design with an array of configurations. It can be used as a short barrel blaster, or you can attach an extended barrel, or then set it up as a bipod with extendable legs to the barrel. The Modulus scope can be attached in any configuration. It includes three six-dart clips, two of which get stored in the stock while the other is attached to the blaster. 
The lone complaint about the Longstrike Modulus is that the bolt-action setting on the side is a bit awkward and slow. If your goal is rapid dart deployment, it will be better to go with a battery-powered blaster or a manual model that is easier to set. 

Deluxe Blaster Comparison