If I didn't know better, I'd say this was a legitimate Nerf product! The gap left by the Camera Optics on top of the ECS-12 is almost perfect for the top-half of an LTAR blaster. The lower portion of the LTAR has the Trigger, Shields, Reload, and Lock-on sensor housed, which could be omitted as it is in this mock-up. The trigger could easily be manipulated to double for both the Dart Blaster and LTAR (just as I have in my Demolisher Project), and there's already a button on the grip of the ECS-12 that could be used for either shields or reload.
With most of the internals and components of the LTAR wouldn't need to be relocated with a design like this, I could see this project being relatively easy to complete, as opposed to my M41A Pulse Rifle and Demolisher projects that require more labor-intensive integration. Does this concept seem cool enough to pursue? Or should I leave it alone and refocus on what I already have?