The fully licensed Armalite and A.R.M.S. sportline M15 airsoft AEG is an affordable entry level AEG package that comes with a battery and charger to get out to the field and play with. The M15 S.I.R. rifle was utilized by U.S. Special Forces due to it's innovative free-float rail system that allowed the rifle to be customized with aftermarket accessories such as the included Stick grip or lights, lasers, PEQ boxes, launchers, and more. The Selective Integrated Rail (S.I.R.) has removable side rails and an extended top picatinny/weaver RIS that acts as a built-in riser which makes using this rifle with a mask and aftermarket optics such as red dots or scopes much easier. The LMT SOPMOD style crane stock acts as a battery compartment for nunchuck style batteries as well. A.R.M.S. licensed front and rear flip up sights can be used to aim or as backups to other optics. Internally, this AEG features a metal gearbox and fires at approximately 344 FPS with 0.20g BBs. An easy to adjust hop up system adds distance and accuracy to this AEG as well.