Thy spyder agressor and alpha black have very different internal parts and are ergonomically different. While The tippmann marker is a cast aluminum, split receiver, the spyder is milled aluminum, with parts that unscrew from the back. They will both shoot 300 fps at about the same rate without modification. The spyder has no forward grip and is a centerfeed (hopper is in the center). The Alpha black is larger with a handguard.