{"product_id":"polarstar-fusion-engine-drop-in-kit-m240b","title":"PolarStar Fusion Engine Drop-In Kit — M240B","description":"\u003cdiv style=\"background:#edfaf1;border-left:4px solid #27ae60;padding:12px 16px;border-radius:0 6px 6px 0;margin:0 0 16px;font-size:13px;\"\u003e\n\u003cstrong style=\"color:#1a6b3a;\"\u003ePolarStar Fusion Engine Drop-In Kit, M240B.\u003c\/strong\u003e The M240B configuration of PolarStar's Fusion. Machined aluminium chassis, dual solenoid, closed bolt, and every electronic part needed for the swap included in the box alongside the pieces particular to the M240B.\n\u003c\/div\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003cp\u003eFitting 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.\u003c\/p\u003e\u003cp\u003eIndependent 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.\u003c\/p\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eSpecifications\u003c\/h2\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:13px;margin:0 0 18px;\"\u003e\n\u003ctr style=\"background:#1B3A6B;color:#fff;\"\u003e\n\u003cth style=\"padding:7px 12px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding:7px 12px;text-align:left;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eComplete drop-in HPA engine, replaces the AEG gearbox\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003ePlatform\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eM240B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eFitment\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eECHO1 M240B pattern\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eChassis\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eFull CNC-machined lightweight aluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eOperation\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eDual solenoid, closed bolt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAdjustment\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003ePoppet and nozzle adjustable independently\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eVelocity\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003e550 fps with 0.20 g at 120 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eRate of fire\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003e30 rps and above in most configurations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAir efficiency\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003e400 plus shots from a 13\/3000 at 1.5 J with 0.28 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eEfficiency test setup\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eBlack poppet, blue nozzle, 6.05 x 375 mm barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eNozzle options\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eSix, each with a different restriction level\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eIncluded\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eFilter fitting fitted, FCU, switchboard, wire harness and the model-specific parts for the conversion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eNot included\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eHPA tank, regulator and line, battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eGel ball\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eCan be configured for gel ball use on request\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eFirst released\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003e2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003ePolarStar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eGood to know\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this the same kit as the rifle version?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I have to buy?\u003c\/strong\u003e A tank, a regulator with a line, and a battery. The electronics side — FCU, switchboard and harness — is already in the box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich M240B is it built for?\u003c\/strong\u003e The ECHO1 pattern. Tell us what you have if it is a different manufacturer and we will check the fit before anything is ordered.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow tunable is it really?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it handle a belt-fed feed system?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cdiv style=\"background:#fffbe6;border-left:4px solid #f0d060;padding:12px 16px;border-radius:0 6px 6px 0;margin:0 0 16px;font-size:13px;\"\u003e\n⚠ \u003cstrong\u003eMind the energy limit:\u003c\/strong\u003e a support weapon is normally held to a lower joule ceiling and a minimum engagement distance than a rifle at the same venue. Read your site's rules for the category before you set a regulator, and chronograph in the configuration you intend to play.\n\u003c\/div\u003e\u003cdiv style=\"background:#1B3A6B;color:#fff;padding:12px 16px;border-radius:6px;margin:18px 0 0;font-size:13px;\"\u003e\n\u003cstrong style=\"color:#fff;\"\u003e💡 Titan Forge Airsoft tip:\u003c\/strong\u003e Pair it with a bottle, an air rig and a line from the \u003ca href=\"\/collections\/hpa\" style=\"color:#cdd6f4;\"\u003eHPA range\u003c\/a\u003e, and see \u003ca href=\"\/collections\/hpa-engines\" style=\"color:#cdd6f4;\"\u003eHPA Engines\u003c\/a\u003e to compare it against the F2, JACK and Kythera. Our workshop will handle the conversion if you want it done for you.\n\u003c\/div\u003e","brand":"Polarstar","offers":[{"title":"Default Title","offer_id":55696832758136,"sku":"76045143","price":519.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0562\/8097\/3450\/files\/PolarStarFusionDrop-InKitM240B_TitanForgeAirsoft.webp?v=1791727288","url":"https:\/\/www.titanforgeairsoft.com\/products\/polarstar-fusion-engine-drop-in-kit-m240b","provider":"Titan Forge Airsoft","version":"1.0","type":"link"}