A quick overview on the features of the Nuprol Delta Pioneer Defender AEG Carbine Pre Two Tone recommended for beginners that is available at Patrol Base... "The internals are the really exciting part of the Pioneer Defender, sharing many components with top-end AEGs, including a quick change spring system, full steel tooth piston, a micro switch trigger, an excellent high torque flat motor and even a 6.03 tight bore barrel.