Bull Craft Knight's Stoner 96 HPA Gearbox Shell

3 OPTIONS TO CHOOSE - Gearbox Only, Gearbox + Nozzle or Gearbox + M249 Fitment Kit (if you are using a standard F2 or Jack) + Nozzle

SEE NEW FEATURES BELOW!

⚠️ NOTE: This gearbox is no longer compatible with the PolarStar V2 Trigger Board due to fitment issues between the body pin and board placement. We’ve pulled it from our lineup to prevent headaches.

💡 Heads-up for F2 and Jack users: If you're running a standard F2 or Jack (not the M249 Kit), you’ll need the full M249 Kit—which includes the plugboard, bullet valve lead, and now a trigger switch (just in case you’re missing one).

🔧 Upgrade your Knight's / Classic Army Stoner 96 with ease. Our Stoner 96 HPA Gearbox is a true drop-in solution, streamlining your HPA engine install with minimal fuss.

✅ Features:

• Dual nozzle alignment points for precision tuning

• Updated specs based on tech and customer feedback

• Built-in compatibility with PolarStar Jack and F2—no shim kit required

🔥 Important nozzle note: You’ll want the #18 nozzle for the F2 (same goes for the Jack). Ignore PolarStar’s #11 recommendation—it doesn’t fit our gearbox. Save yourself the frustration.

🛠️ Hop-up mod required: You’ll need to elongate/open the hop-up window to ensure proper BB feed. Both Bullgear and stock hop-ups have needed this tweak.

NEW FEATURES:

• Front-side wire and FCU passthrough

• Rear FCU cavity for clean rear wiring

• Precision-aligned front pin—no shims needed for Jack or F2 installs