electromagnetic · EPM delay
EPM Gasless Delay
R&DPatentedElectropermanent magnets time the bolt with zero gas tap and zero springs.
- Platforms
- AR-15
- Calibers
- 5.56 NATO, .300 BLK
- Partner
- Frytech R&D
- Patent
- US 12,117,257 B1
How it works
An electropermanent magnet (EPM) holds or releases with a short pulse, then stays in that state with no continuous power.
Mounted in the BCG or upper, it can hold the bolt until a timed release — a delay without a gas port.
Suppressed guns stay cleaner because there is no gas tap driving the action. This is a disclosed R&D concept, not a kit.
An EPM sandwiches a hard magnet and a switchable magnet in a yoke. A coil pulse flips the switchable magnet, redirecting flux. Holding force then needs no current.
Spec
| Platform | AR-15 upper / BCG concept |
|---|---|
| Internals | EPM pair + pulse driver |
| Maintenance | Electronics as designed |
| Install | R&D / SBIR — not drop-in |
| Compatibility | Gasless delayed concepts |
Versus mil-spec spring
- No gas tube
- No springs in the delay path
- Cleaner suppressed cycle