{"title":"FCU \/ Electronics","description":"\u003cp\u003eFire control units and electronic components for advanced airsoft rifle control and customization.\u003c\/p\u003e","products":[{"product_id":"polarstar-fcu-fire-control-unit-rev-3-universal","title":"Polarstar FCU - Fire Control Unit, Rev. 3, Universal","description":"\u003cp\u003eAn FCU (Fire Control Unit) is needed for all Polarstar rifles with the acception of the Polarstar Kythera. If buying this with a Polarstar rifle from KA Tech Airsoft it will come pre tuned for that specific rifle. If your buying this as a solo product and you would like it tuned for your rifle please fill out the contact form or leave a comment giving the following details, the more specific the better \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWhich Polarstar Engine - Ex. Polarstar Jack\u003c\/li\u003e\n\u003cli\u003eHopup unit ------------- Ex. Maxx me pro M4A\u003c\/li\u003e\n\u003cli\u003eBucking ---------------- Ex. Maple leaf macron 70 degree\u003c\/li\u003e\n\u003cli\u003eInner barrel ------------- Ex. Prometheus 6.03 363mm \u003c\/li\u003e\n\u003cli\u003eWhich Mags you use ---- Ex. PTS EMP1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eThe REV3 FCU follows the classic design of our very first FCU and it is considered to be the finest fire control units on the market. Since it is equipped with an LCD screen and joystick you are able to easily scroll through menus and precisely adjust settings for the utmost control over the system. This FCU is also universally compatible with all PolarStar HPA systems including both dual and single-solenoid systems.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eThis latest REV3 model features updated voltage regulators which greatly improve energy efficiency as well as significantly reducing its overall size. Although it is large when compared the Mini FCU, the REV3 FCU is compact enough to fit into a M4's buffer tube along with a small 300mAh Lipo pack.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eAnother great feature to this FCU is its integral Motor Control Unit (MCU) which allows it to run a box magazine through the MCU port. \u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLCD screen and Joystick for easy and precise adjustments.\u003c\/li\u003e\n\u003cli\u003eCompact 2.25\" x 0.9\" footprint.\u003c\/li\u003e\n\u003cli\u003eIntegral Motor Control Unit (MCU).\u003c\/li\u003e\n\u003cli\u003eCompatible with both Dual and Single-Solenoid HPA systems.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KA Tech Airsoft ","offers":[{"title":"New","offer_id":44409283346466,"sku":"10000256","price":81.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/5355\/8050\/files\/ChatGPT_Image_May_14_2026_01_26_43_AM_3.png?v=1778788032"},{"product_id":"polarstar-trigger-board-aeg-gearbox","title":"Polarstar Trigger Board for AEG Gearbox Conversions – Fusion Engine Excluded","description":"Replacement electronic trigger switchboards for PolarStar HPA systems (Fusion Engine excluded). \nDesigned for AEG gearbox conversions and compatible with specific platforms including Ares Amoeba, HK417, S\u0026amp;T Tavor 21, V2, V3, and Ares V2\/V3. \nEach switchboard provides reliable electronic trigger actuation and is built to PolarStar’s quality standards.\u003cbr\u003e\u003cbr\u003e\n\u003cb\u003eNotes:\u003c\/b\u003e Standard and Semi-Locked versions available for each model.","brand":"PolarStar Airsoft","offers":[{"title":"V2 \/ Standard","offer_id":44412639772706,"sku":"10000205","price":24.25,"currency_code":"USD","in_stock":true},{"title":"V2 \/ Semi-Locked \/ Used","offer_id":44412639805474,"sku":"10000205-SL","price":24.25,"currency_code":"USD","in_stock":true},{"title":"V3 \/ Standard","offer_id":44412639838242,"sku":"10000206","price":38.0,"currency_code":"USD","in_stock":true},{"title":"V3 \/ Semi-Locked \/ Used","offer_id":44412639871010,"sku":"10000206-SL","price":38.0,"currency_code":"USD","in_stock":true},{"title":"Ares Amoeba (Harness sold separately) \/ Standard","offer_id":44412639576098,"sku":"10000276","price":45.4,"currency_code":"USD","in_stock":true},{"title":"Ares Amoeba (Harness sold separately) \/ Semi-Locked \/ Used","offer_id":44412639608866,"sku":"10000276-SL","price":45.4,"currency_code":"USD","in_stock":true},{"title":"HK417 (Post, Spring and 6″ trigger lead included) \/ Standard","offer_id":44412639641634,"sku":"10003333","price":41.5,"currency_code":"USD","in_stock":true},{"title":"HK417 (Post, Spring and 6″ trigger lead included) \/ Semi-Locked \/ Used","offer_id":44412639674402,"sku":"10003333-SL","price":41.5,"currency_code":"USD","in_stock":true},{"title":"S\u0026T Tavor 21 (Includes 6″ trigger lead), JACK\/F1 Only \/ Standard","offer_id":44412639707170,"sku":"10000506","price":29.0,"currency_code":"USD","in_stock":true},{"title":"S\u0026T Tavor 21 (Includes 6″ trigger lead), JACK\/F1 Only \/ Semi-Locked \/ Used","offer_id":44412639739938,"sku":"10000506-SL","price":29.0,"currency_code":"USD","in_stock":true},{"title":"Ares V2 \/ V3 (Post, Spring and 6″ trigger lead included) \/ Standard","offer_id":44412639903778,"sku":"10000424","price":51.0,"currency_code":"USD","in_stock":true},{"title":"Ares V2 \/ V3 (Post, Spring and 6″ trigger lead included) \/ Semi-Locked \/ Used","offer_id":44412639936546,"sku":"10000424-SL","price":51.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/5355\/8050\/files\/v2.webp?v=1772407805"},{"product_id":"blackleaf-airsoft-speed-board-for-polarstar-jack-f1-f2-v2-safety-select-fire","title":"BlackLeaf Airsoft Speed Board for PolarStar Jack, F1, F2 | V2 Safety \u0026 Select Fire","description":"\u003cp\u003eThe BlackLeaf Airsoft Speed Board for PolarStar Jack \/ F1 \/ F2 | Safety \/ Select Fire allows you to have an enhanced trigger switch.  \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSemi\/Full Auto\u003c\/li\u003e\n\u003cli\u003e0.25mm Trigger Travel\u003c\/li\u003e\n\u003cli\u003eElectromechanical Safety (Selector plate and Safety Lever are Required!)\u003c\/li\u003e\n\u003cli\u003eWorks with the PolarStar Jack, F1, and F2\u003c\/li\u003e\n\u003cli\u003eWorks with M4 \/ V2 Style gearboxes with traditional trigger mechanics. Not Ares, Amoeba, etc.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KA Tech Airsoft ","offers":[{"title":"Semi \/ Auto","offer_id":44412679618594,"sku":"BL-TB-07A","price":45.0,"currency_code":"USD","in_stock":true},{"title":"Semi Locked","offer_id":44412679651362,"sku":"BL-TB-07A-SL","price":45.0,"currency_code":"USD","in_stock":true}]},{"product_id":"bullet-valve-lead-for-214-and-309-solenoids","title":"Bullet Valve Lead for 214 and 309 solenoids","description":"","brand":"KA Tech Airsoft ","offers":[{"title":"Default Title","offer_id":44412970532898,"sku":"10000479","price":7.0,"currency_code":"USD","in_stock":true}]},{"product_id":"trigger-lead-6-universal-2-pin-jst-bare-lead","title":"Trigger Lead - 6\", Universal (2 pin JST \/ Bare Lead)","description":"","brand":"KA Tech Airsoft ","offers":[{"title":"Default Title","offer_id":44412970598434,"sku":"10000478","price":6.5,"currency_code":"USD","in_stock":true}]},{"product_id":"ka-tech-on-off-led-switch","title":"On\/Off LED Push Button Switch","description":"\u003cp\u003eThis is a LED On\/Off push button switch. We install these in the back cap of the Monk Oracle One V2 builds. These can also be installed in other ESG-style builds if you are comfortable with wiring and drilling your own hole.\u003c\/p\u003e\n\n\u003cp\u003eIf you have a V1 Oracle, this is the item for you. You can drill out your back cap and add this for an On\/Off battery cutoff.\u003c\/p\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003ePre-wired and labeled LED On\/Off push button switch\u003c\/li\u003e\n\u003cli\u003eExtra set of wiring cables for the battery and FCU — run a longer or shorter setup as needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation\u003c\/h4\u003e\n\u003cp\u003eSimply plug your FCU and battery into the 2 labeled leads and you're done. Routing the cables will be your only challenge. Installing this item will make your lower and grip frame a tight fit — but once it's in, it's a clean and safe way to operate your airsoft build.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e⚠️ We offer no wiring advice or assistance.\u003c\/strong\u003e If you don't feel confident installing this item, please seek out an airsoft tech who knows electrical wiring and routing. Improper installation can damage your electronics.\u003c\/p\u003e","brand":"KA Tech Airsoft","offers":[{"title":"White","offer_id":45901043367970,"sku":"LED-SWITCH-WHITE","price":85.0,"currency_code":"USD","in_stock":true},{"title":"Orange","offer_id":45901043400738,"sku":"LED-SWITCH-ORANGE","price":85.0,"currency_code":"USD","in_stock":true},{"title":"Red","offer_id":45901043433506,"sku":"LED-SWITCH-RED","price":85.0,"currency_code":"USD","in_stock":true},{"title":"Green","offer_id":45901043466274,"sku":"LED-SWITCH-GREEN","price":85.0,"currency_code":"USD","in_stock":true},{"title":"Blue","offer_id":45901043499042,"sku":"LED-SWITCH-BLUE","price":85.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/5355\/8050\/files\/ChatGPT_Image_Jul_7_2026_03_41_05_PM_6.png?v=1783464109"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/5355\/8050\/collections\/ChatGPT_Image_May_15_2026_10_53_03_PM_2-8907037.png?v=1778953531","url":"https:\/\/www.katechairsoft.com\/collections\/fcu-electronics.oembed","provider":"KA Tech Airsoft ","version":"1.0","type":"link"}