ZERO Cap Alginment

The ZERO Cap Alignment is an adapter that connects your XX-Mod or NEXXUS directly to the ROTO hop-up chamber. It is compatible with the XX-Mod Pro Bolt and the NEXXUS Bolt. The two parts stop being separate pieces that sit near each other. They become one whole unit, and that gives you perfect alignment between the nozzle and the hop-up, every time.

Why does that matter? In a normal setup, the engine and the hop-up chamber are held in place by the receiver. If the alignment is not perfect, the nozzle enters the chamber at an angle. It can also move around inside the hop-up while you shoot. Each BB then gets loaded a little differently, and your shots become hard to predict.

The receiver itself is often part of the problem. Many upper receivers have high tolerances, so the hop-up is never truly lined up with the nozzle. The result is something every player knows: very strange, random shots that no tuning seems to fix. With the ZERO Cap Alignment, the receiver no longer decides where your hop-up sits. Your engine and the ROTO hold each other in line.

Perfect nozzle alignment: the nozzle goes straight into the chamber, shot after shot.
Independent from receiver tolerances: your accuracy no longer depends on how well your upper receiver was made.
More consistent shots: the random flyers caused by misalignment are gone.

It is also easy to use. No complicated fitting work, just a cleaner and more stable connection between your HPA engine and your hop-up.

Not running a ROTO? The ZERO Cap Alignment is also compatible with the Maxx Model M4A, M4I and M4P hop-up chambers.

For the best result, pair it with the Step Nozzle 67. The ZERO Cap Alignment keeps everything in line. The Step Nozzle improves BB positioning and the seal inside the ROTO. Together, they will significantly improve your shooting experience.

Important Note: the ZERO Cap Alignment is designed to connect the XX-Mod Pro Bolt or the NEXXUS Bolt with the ROTO hop-up chamber or the Maxx Model M4A, M4I and M4P hop-up chambers.