PolarStar F2 Direct Attachment Conversion Set (for Hop Up Thing)

PolarStar F2 Direct Attachment Conversion Set

The Alignment Revolution is a Monolithic Assembly.

If you've ever spent hours shimming a gearbox shell just to have your nozzle tilt .5mm and ruin your grouping, you know the pain. PolarStar got tired of "good enough" alignment. So they made this.

The PolarStar Direct Attachment is a replacement for the original front cylinder on your F2 or JACK.

What gearbox does this fit?

Short answer: it doesn't exactly need one. The Direct Attachment replaces the front cylinder on your F2 or JACK and connects directly to The PolarStar Hop Up Thing, allowing the engine to mount directly to the hop-up itself. In a traditional gearbox, the upper shell positions and aligns the HPA system with the hop-up. Because the alignment is now built into the Direct Attachment front cylinders, that portion of the gearbox is no longer needed. The electronics, and trigger/selector system can still be housed in a modified shell, a printed lower, or a completely custom chassis.

How It Works

It's a two-piece system: the Direct Attach Front Cylinder and an internal Adapter.

When you thread our Hop Up directly into this assembly, the HPA engine, the hop-up, and the inner barrel become one single, rigid, monolithic unit.

Why does that matter?

• Zero Nozzle Deflection — By locking everything together, there's no room for the nozzle to wiggle or lean when it's loading a BB.
• Consistency = Groups — If the BB loads exactly the same way every time, the hop-up effect stays consistent. Consistent hop means tighter groupings. It's not magic, it's just better support.
• Perfect Alignment — It's physically impossible for the nozzle to be misaligned with the bore. If it's crooked, you probably cross-threaded it. Don't do that.

The Best Part? PolarStar leaving the rest to you.

Whether you're dropping this into a standard shell to finally fix a lemon or building a scratch-made sci-fi blaster from a 3D printer, this system is only limited by your imagination.

Note: The Direct Attachment Front Cylinder and Adapter are sold as shown. The F2 engine, hop-up, and Monk Oracle shell shown in product images are not included and sold separately.