PolarStar Fusion Engine Drop-In Kit — M240B
PolarStar Fusion Engine Drop-In Kit — M240B
In stock
Notify Me About This Product
Couldn't load pickup availability
DETAILS
DETAILS
- description
The M240B is a heavy gun before anyone adds anything to it, and that changes what you want from a conversion. Weight you cannot avoid; reliability you can buy. Taking the electric gearbox out and putting a machined chassis and a solenoid in its place removes most of the wearing parts from a weapon that gets used in long bursts from static positions, which is exactly the duty cycle that destroys gearboxes.
Fitting is a full replacement of the original gearbox. The Fusion chassis carries its own trigger micro-switch built into the frame, and the kit is supplied configured for this platform specifically — filter fitting already installed, FCU, switchboard, wire harness, and the extra components the M240B needs that a rifle kit would not contain. Buying the kit for the right model is the whole trick with these.
Independent control over firing air and feeding is what the dual solenoid buys you. One solenoid drives the poppet, which meters the air that pushes the BB; the other drives the nozzle, which decides how the round is fed. Keeping them separate means a change to one is not an accidental change to the other, and on a belt-fed replica with a long feed path that separation is worth having. The closed-bolt cycle is also more forgiving of a hop-up that is not perfect than an open-bolt engine would be.
The quoted ceiling is 550 fps with a 0.20 g at 120 psi, with 30 rounds per second and above achievable — figures that describe capability, not a legal setting here. Six nozzle restrictions shift the whole usable adjustment range at a stroke, so you reach a British site limit by choosing the right nozzle and pressure rather than by fighting the engine. Tuned to field energy with restrictive internals it returns more than 400 shots from a 13/3000.
Specifications
| Specification | Detail |
|---|---|
| Type | Complete drop-in HPA engine, replaces the AEG gearbox |
| Platform | M240B |
| Fitment | ECHO1 M240B pattern |
| Chassis | Full CNC-machined lightweight aluminium |
| Operation | Dual solenoid, closed bolt |
| Adjustment | Poppet and nozzle adjustable independently |
| Velocity | 550 fps with 0.20 g at 120 psi |
| Rate of fire | 30 rps and above in most configurations |
| Air efficiency | 400 plus shots from a 13/3000 at 1.5 J with 0.28 g |
| Efficiency test setup | Black poppet, blue nozzle, 6.05 x 375 mm barrel |
| Nozzle options | Six, each with a different restriction level |
| Included | Filter fitting fitted, FCU, switchboard, wire harness and the model-specific parts for the conversion |
| Not included | HPA tank, regulator and line, battery |
| Gel ball | Can be configured for gel ball use on request |
| First released | 2011 |
| Brand | PolarStar |
Good to know
Is this the same kit as the rifle version? No. The engine is common but each kit ships configured for one platform, with the mounting and conversion parts for that gun. An M4 kit will not convert an M240B.
What else do I have to buy? A tank, a regulator with a line, and a battery. The electronics side — FCU, switchboard and harness — is already in the box.
Which M240B is it built for? The ECHO1 pattern. Tell us what you have if it is a different manufacturer and we will check the fit before anything is ordered.
How tunable is it really? PolarStar describe the Fusion as their most adjustable system, with the widest span of both velocity and rate of fire, and the six nozzles are how you move that span rather than just nudging pressure.
Does it handle a belt-fed feed system? The engine does its job at the nozzle; the box or belt mechanism is still the gun's own. Feeding faster than the magazine can supply is the usual limit on rate of fire, not the engine.