Recognizing a specific performance need in high-end airsoft builds, Black Talon Concepts changed the mostFET market forever. Improving over their original BTC Chimera, the BTC Spectre for V2 gearboxes was created and this hard-to-get mostFET unit is the desire of gun-techs and extreme performance junkies world-wide.

The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or mosFET) is a type of transistor used for amplifying or switching electronic signals.

How does this apply to airsoft?

Inside your AEG airsoft rifle is a gearbox, and inside that houses a trigger unit. This trigger unit relys on some electrical contacts that over time, with extensive high-powered battery use, wear out / literally burn due to a spark occurring to trigger the unit to fire with each trigger pull.

A mosFET unit removes this by replacing the housing around the trigger with a low-current pulse that reduces wear & tear significantly. 11.1v Lipo’s, here you come!

BTC Spectre - Before vs After

The Spectre FET is a compact version of the Chimera designed specifically for AEGs with limited or no room for an external FET. Like the Chimera MK.II, the Spectre uses a new form of cycle detection which can easily keep up with extreme RoF (up to 80rd/s) and is more reliable then the previous “cutoff lever detection” method. This new design also allows the cutoff lever to be completely removed, eliminating the most common cause of semi-fire issues in AEGs. Absolutely no modications are required in TM-spec gearboxes, making this a true “drop-in” FET!

The Spectre utilizes FOUR powerful next-generation “DirectFETs”: two for driving the motor and two for dynamic braking with a combined current rating of 540A for each pair. Despite its smaller size the Spectre still manages to retain all the features found on the Chimera Mk.II and is even fully compatible with the ASCU hopup sensor for V2 gearboxes.

After installing the BTC Spectre FET I immediately notice the crazy trigger response. It will make you giddy like a little school girl! The burst fire options are fantastic. It allows for fast-firing bursts to keep BB groups surprisingly tight down-range. With an upgrade hop-unit and inner barrel you’ll have no problem providing devastating fire upon your fellow airsoft Op-for.

The best mosFET unit I’ve ever used!

Buy BTC Spectre MosFET

Shutup, and take my money!

You know you want one. Take your airsoft gun to the next level. Experience performance similar to a Systema PTW platform, a legendary airsoft manufacturer. The BTC Spectre delivers the ultimate trigger response.

BTC Spectre Breakdown*

Dynamic Braking

  • Eliminates the motor spin-down time to prevent the piston from over-traveling.
  • Assists in keeping the piston properly reset to reduce stress on the gearbox.
  • Prevents double firing on semi-fire in extremely high RoF setups.
  • Also driven by dual IRF671812PBF MOSFETs!

Fully Configurable Fire Select

  • Both fire select positions can be individually configured, for a total of 64 possible configurations.
  • Available options for each selector position:
    • Semi fire
    • Auto fire
    • 2 round burst
    • 3 round burst
    • 4 round burst
    • 5 round burst
    • Semi with ramping
    • Burst-auto hybrid
  • “Semi w/ Ramping” fires in semi and switches to full auto if the trigger is rapidly tapped.
  • “Burst-auto hybrid” fires in burst and switches to full auto if the trigger remains held down.
  • Can convert any AEG to semi-only by having both selector positions set to semi fire.

LiPo / LiFePO4 Monitoring

  • Monitors LiPo and LiFePO4 batteries to cutoff power before overdischarge occurs.
  • Simply set the number of cells and the controller will use the proper cutoff voltage.

Programmable Digital Fuse

  • Sensor-based current monitoring negates the need for a physical fuse.
  • Cutoff threshold fully adjustable to help protect low-output batteries from over-current damage.

Gearbox Reliability

  • Eliminates the trigger jam normally caused by the cutoff lever stopping at a certain position.
  • The cutoff lever mechanism is no longer needed, greatly reducing the chances of semi-fire related issues.
  • The anti-reversal latch can also be removed to make gearbox reassembly much easier.

Hopup Sensor Compatible

  • Fully compatible with Airsoft System’s hopup sensor unit to prevent firing when the mag is empty.

Advanced Technology

  • Can handle power surges up to 9000 watts and even run on car batteries!
  • Fully computerized and driven by a high speed PIC18F14K22 microprocessor.
  • Multiple internal layers of heavy copper traces for greater current capacity.
  • Short circuit detection and voltage spike suppression circuits to protect the controller.
  • Smart thermal management allows the controller to remain cool under sustained firing.

MOSFET Trigger

  • Eliminates damaging electrical arcing of the trigger switch contacts.
  • Lower resistance compared to mechanical switching, increasing motor current.
  • Driven by dual IRF671812PBF, a compact yet powerful next-gen MOSFET!

Cycle Completion

  • Gearbox always completes the last cycle regardless of when the trigger is released.
  • Assists in keeping the piston properly reset to reduce stress on the gearbox.
  • The motor will always have the smoothest and most consistent startup.
  • Allows the anti-reversal latch to be removed.

Realistic RoF Control

  • Both fire select positions can be individually configured with a different RoF.
  • Every cycle runs at full speed and pauses between each shot to reduce the RoF.
  • Provides the most realistic feel and sound compared to any other forms of RoF reduction.

Adjustable Precocking

  • Precocking stops the piston in a compressed state so the next shot is near-instantaneous.
  • The precocking is fully adjustable and thus also compatible with short-stroked pistons.
  • Offers improved realism and trigger response for sniper or low RoF builds.

Electrical Ratings

Minimum Maximum
 Supply Voltage 6.5 16 V
Continuous Peak
 Motor Current 60 500 A
 FET Resistance 0.001 Ω


Length Width Height
 Board Size 1.7 1.1 0.5 inch
Gauge & Type
 FET Wiring 16AWG Ecowire(mPPE)


Included Items

  • Specter V2 Gearbox FET
  • Deans-Tamiya Adapter
  • User Manual

BTC Spectre V2 Gearbox Manual

Format: PDF

Click to download a PDF manual for the BTC Spectre V2 Gearbox (English).

The TM G3 gearbox and ICS split-gearbox are not compatible with the Spectre at the moment. V2 gearboxes with proprietary selector plates may require modifications to properly engage the fire select switches.

Nothing else is needed. A Deans-to-Tamiya adapter is also included for the non-LiPo battery users.

The Spectre is only compatible with rear wired setups at the moment.

The included motor/gearbox wires are Ecowire(mPPE) insulated, which is MUCH tougher than the more common PVC and silicone wires, just as thin as Teflon(PTFE) wires, and also very flexible. This reduces the likelihood of wires being torn in the gearbox, allows 16AWG wiring to easily fit in the gearbox, and the flexibility makes it easier to manage.

* All information taken from Black Talon Customs website. No affiliate links used in this article. Not a sponsor.

Buy a BTC Spectre MosFET

Shutup, and take my money!

Perform better then a Gas Blowback! Take your AEG airsoft gun to the next level. The BTC Spectre delivers the ultimate trigger response you want!


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