Sorry for the shoddy picture here.. I'll take another one tomorrow or when I bring this when I cosplay ODST next.
Used a Nerf Longstrike as a base, with a PVC pipe barrel replacement in the Recon barrel. The scope was made from the Longshot scope. Any non Stock Nerf parts on it is made using my normal cardboard method. I used Grey Spray Primer, with a combo of acrylic and Citadel paints (did not have access to Citadel Airgun). And tomorrow I will finish it with Spray Varnish/Sealant.
It still operates as a Nerf gun, but due the long barrel, its pointless, even with internal mods.
Next mod will be the ODST custom Magnum. I'm making it from a Wii stick accessory.