The AMOEBA M4 AEG Airsoft series is unlike any other AEG when it comes to innovation and functional yet they're unique style. Internally, all AMOEBA AEG's come equipped with the EFCS (Electronic Firing Control System) programmable version 2 gearbox as well as a quick change spring system. The EFCS function allows you to program your selectable firing modes with the AMOEBA EFCS Programmer (*Sold Separately). Externally, the AMOEBA airsoft rifle series brings sleek and aggressive construction that is quickly noticed on the field; setting the AMOEBA line of M4 AEG's in a league of their own. You'll also find slick AMOEBA accessories from EliteForceAirsoft.com. If you are looking for an M4 AEG that can turn heads and also perform, make sure to find the AMOEBA with the flat trigger. The flat trigger is the synonymous feature from Elite Force to know that your AMOEBA AEG is backed by a warranty from us!