Maxx Model AEG Steel Cylinder Li-Ion Battery The HK MP5 Competition SD6

The HK MP5 Competition SD6 AEG

The select-fire G18c can change from semi-auto to full-auto with the flip of its rear slide switch

Comes in black and silver CNC metal colors

This HPA system is a radical departure from all previous systems that PolarStar has produced since the Kythera does not use a battery

Being able to see where the BB's are going lets you aim better

Maxx Model AEG Steel Cylinder Li-Ion Battery The HK MP5 Competition SD6The 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.