controls · Delay couplet
Magnetic Delay
PrototypeTwo N52 pulling two N52. The bolt stays until it breaks free.
- Platforms
- AR-15, 12-ga AR shotgun, AR-9 / PCC
- Calibers
- 5.56 NATO, 12 ga, 9mm
- Partner
- Frytech R&D
- Patent
- Family / provisional
How it works
Unlike poles face across a set air gap. Each side is two N52 discs stacked (2-on-2), so the couplet is roughly double the thickness of a single pair.
The couplet holds the carrier in battery. Recoil has to overcome breakaway force. Until it does, the bolt does not move — that is the delay, measured in milliseconds of hold, not a gas-port timer.
Once the gap opens, attraction collapses fast (axial pull falls with gap). The like-pole MBS stack — or the hybrid buffer — then takes the stroke.
On return, if leftover energy is below snap work, the couplet grabs again. Recapture kills bounce. If return energy is too high, it can leak past — that is why diameter, thickness, stack, and gap are the lab knobs.
Axial attraction of coaxial N52 discs falls fast with gap. Snap work is the integral of that force over the opening. Hold delay is the time a typical BCG spends loading that couplet. Recapture is just energy accounting: return KE vs snap work.
Frytech
Magnetic delay
Two N52 magnets pulling on two N52 magnets. Unlike poles face each other. The bolt stays until that couplet breaks free — then the same pair recaptures on the way home.
Unlike poles are locked. The couplet holds the bolt.
2 on 2 N52 couplet
Live gap 0.03 in · 9.4 lbf
Breakaway
Holding — has to break free
Bolt race · JP vs Delay
Diameter
Each magnet
Stack
0.03 in
- Breakaway
- 9.4 lbf
- Snap work
- 0.07 ft·lbf
- Hold delay
- 23.8 ms
- Bounce
- Can leak
Pull vs gap
Spec
| Platform | Buffer delay couplet / shotgun timing |
|---|---|
| Internals | 2×2 N52 unlike-pole pair (prototype) |
| Maintenance | Sealed magnets |
| Install | Integrated with MBS Hybrid / delay builds |
| Compatibility | AR and AR-shotgun envelopes |
Versus mil-spec spring
- Delay without a gas system
- Defined breakaway in lbf
- Recapture kills bounce
- Tune by diameter, thickness, stack, gap