The Nerf Longshot CS-6 is a good gun, with ranges of about 25-30 ft. Although the main gun is good, the first thing you need to do is scrap the front gun. The front gun of the Longshot is completely useless. It has less range than a secret strike, and it has a very low rate of fire, as you need to load it like a Nite Finder. Futhermore, the barrel part of it does not increase accuracy at all; it actually decreases range too. So if you get a Longshot, you need to scrap the front gun.
The Longshot comes with one main gun, one front gun, one scope, 2 N-Strike clips, and 12 streamline darts that can be used in any clip system gun.
Because the Longshot is a direct plunger system, it can be easily modified to shoot farther, but if your not careful you can break internals by addeing too much spring power.
All in all, the Longshot is a pretty good gun, and if you modify it according to the mod guide I posted a little while ago, it can make an excellent long range weapon.