The Classic Army Full Metal CA90TR is a huge step up from the CA90 Sportline, it's practically a different gun. The top receiver is very well machined out of high grade metal. The plastic used for the lower receiver is noticeably more durable than the sportline, the entire gun gives off an aura of sturdiness. The built in rails are perfect for mounting your preferred optics, lasers, or flashlights. The charging handle is functional but doesn't open an compartments. The battery space is small but fitting an 8.4v mini will not be a problem. Included with the CA90TR is a SOCOM style barrel extension and an extended inner barrel for when the barrel extension is in use. With the longer inner barrel installed the CA90TR is an excellent contender for outdoor games, and it doesn't look half bad with the barrel extension either. Internally Classic Army have fitted the CA90 with a 7mm ball bearing gearbox and a metal hop up unit. This is an extremely well made gun, finally someone is stepping up to the plate to contend with the Marui E90.