hybrid · 8-magnet prototype
Passive Magnetic Stack
PrototypePatentedEight rare-earth magnets, like poles facing. The prototype that proved the field can replace the spring.
- Platforms
- AR-15, AR-10 / DPMS, AR-9 / PCC, 12-ga AR shotgun
- Calibers
- 5.56 NATO, .308 Win, 9mm, 12 ga
- Partner
- Frytech R&D
- Patent
- US 12,117,257 B1
How it works
Eight discs, like poles facing, sealed in the tube. No coil spring. The carrier wades into a field that gets stiffer as the magnets close.
This is the lab unit that showed a magnetic buffer could cycle a gun without a steel spring. It is not what ships from PAMAX.
The stack is sealed so grit and oil never become the wear surface. There is no spring to take a set — on the prototype. Commercial hybrid units keep a tuned spring for return energy.
For coaxial discs the axial force scales with area and roughly 1/gap² in the working range. That curve is why a magnetic buffer can feel soft at the shoulder and still stop the carrier without a bang.
Frytech
Hybrid assembly
One axis. Magnets float apart because like poles shove. Spring and copper slugs run the same direction — barrels, not coins on their side.
Floating apart
Like poles shove the discs open. Gaps are the spring.
Kit
Magnets
Spring
Copper slugs
0%
- Air gap
- 0.18 in
- Magnet wall
- 0 lbf
- Spring
- Off
- Eddy
- No copper
Spec
| Platform | Prototype MBS tube |
|---|---|
| Internals | 8 rare-earth discs, like-pole, sealed, springless |
| Maintenance | Lab sealed stack |
| Install | R&D buffer — not the PAMAX SKU |
| Compatibility | Mil-spec and commercial extensions (prototype) |
Versus mil-spec spring
- Progressive, not linear
- No coil bind, no twang
- Proved the field can do the spring’s job
- Tunable by magnet size