Maxx Model AEG Steel Cylinder

The Maxx Model AEG Steel Cylinder. Made of hardened stainless steel in a variety of AEG styles. Precision made - it's probably the nicest aftermarket cylinder series we've ever seen. For a variety of different barrel lengths - vented holes per each length (see drop-down menu). Most M4 guns are the 300-400mm barrel style. Fits in all gearboxes - pick which approximate barrel length you have for optimal performance.