commercial · MBS-FRT
MBS-FRT
PrototypePatentedMagnetic buffer for forced-reset and Super Safety-style trigger packs.
- Platforms
- AR-15
- Calibers
- 5.56 NATO, 9mm
- Partner
- Frytech R&D
- Patent
- US 12,117,257 B1
How it works
Forced-reset and similar packs need the bolt to come home with authority and not bounce. A soft spring can short-stroke; a hard spring can bounce.
MBS-FRT uses magnetic damping to kill bounce, then a weighted H3-class mass so there is still enough energy to strip a round — including from linked belts in R&D fixtures.
This is a specialist buffer, not a general carbine replacement. It is shown here as a platform variant, not a consumer SKU list.
Magnetic restoring force is velocity-agnostic at first order (position-based 1/r²). Adding mass sets cyclic timing. Together they hold a return energy window that a surging coil spring cannot.
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
- 0 lbf
- Eddy
- No copper
Spec
| Platform | AR-15 with FRT / Super Safety-class packs |
|---|---|
| Internals | Hybrid magnetic damping + H3-class weight |
| Maintenance | Sealed stack; inspect weights as any buffer |
| Install | Carbine extension |
| Compatibility | Where those trigger packs are lawful; not a fire-control device |
Versus mil-spec spring
- Bolt bounce control without hydraulic fade
- Return energy kept in a usable band
- Same licensed magnet family as MBS-C