They will not fit in standard AEG Cylinders

SPECIFICATIONS CONSTRUCTION: METAL

1 x CNC Delrin Locking C-Clip

saving battery life exponentially if players forgot to unplug the battery after use

1 pistols and also both plastic/metal slides

Elite Force M4 Black Crane Stock Drum They will not fit inLooking for a new or replacement stock for your Elite Force M4 Series Rifle? Look no further, this Crane Stock System is the perfect replacement and upgrade for your airsoft rifle. Features an integrated battery compartment for storing a variety of different batteries and offers better balance and feel over the standard stock system. If you're serious about airsoft then you need the Elite Force M4 Series Black Crane Stock System! Get yours today!