I bought a 1077 old style, cause I was bored, and wanted to see what a Modified 1077 was capable of, for the only purpose of getting it to shoot Much tighter group at a further distance. I also did the Hop up mods, to see how hot it could shoot. It was a significant difference from out of the box, vs a Modified 1077. The barrel inside the shroud moved around quite a bit so POI was all over the place out of the box, that needed to be stabilized, once the movement of the barrel had been taken care of, I moved on to sealing the Co2 leaks so that it would be more efficient in its use of co2, that really made a significant increase in FPS based on Impact of target. I had fun modifing this dirt cheap gun.