Echo1 M4 Troy MRF-S 4.5” Barrel AEG full metal Airsoft Gun. This sold out everywhere Echo1 Troy licensed m4 mrf-s 4.5” barrel is the perfect CQB and milsim weapon. It is a full metal weapon with a realistic feel, weight, and an extremely reliable gun and fun to play with. The features of this gun such as flip up iron sights and the metal handrails are perfect for play. This compact gun is easily accessorized and comes with a high capacity magazine, 2 mid capacity magazines, battery, and original box.