The Valken ASL+ Series Kilo.45 AEG adds several new features to our normal ASL Series rifles. Valken has upgraded the internal components to provide less stress on the gearbox, including a 22:1 ration gear set, piston with full metal teeth, and radial cuts in the gearbox shell. The ASL+ series also comes with a rotary style hop-up unit with locking increment settings. The Kilo.45 rifle also comes with new external features, including a newly designed molded flash hider, 260-round hi-cap SMG style magazine, and SMG magazine adapter that fits inside the M4 magazine well. All ASL+ series rifles are also covered by the Valken 1-year bulletproof warranty.