M249 Fitment Kit — REQUIRED for Bull Craft Stoner 96 HPA Gearbox w/ NON-M249 Engines
Read carefully. This is not optional.
This Fitment Kit is REQUIRED when installing a NON-M249 PolarStar F2 or Jack engine into a Bull Craft SLS-printed Stoner 96 HPA gearbox.
If the engine is not labeled M249-specific, you must use this kit.
Without it:- The engine will not fit correctly
- Alignment will be wrong
- Performance will suffer
- Reliability cannot be guaranteed
There are no substitutes and no workarounds. This kit exists exclusively to adapt standard (NON-M249) PolarStar engines to our printed gearbox.
? NOT REQUIRED — READ THIS
You DO NOT NEED THIS KIT if you are using a PolarStar F2 or Jack that is M249-SPECIFIC.
M249-specific engines already include these components from PolarStar and are ready to install directly into our gearbox.
If you’re unsure which engine you have—verify before ordering.
? What’s Included
• Bullet Valve — required for correct air delivery
• Plug Board — ensures proper electrical interface
• Trigger Switch — included as a backup for builds lacking one
These are the exact components required to make a NON-M249 engine function correctly in the Bull Craft Stoner 96 HPA gearbox.
Built for our gearbox.
Required for NON-M249 engines.
