{"product_id":"a-k-cylinder-set-for-systema-ptw-ctw-stw-m4-series-m140-red-1","title":"A\u0026K Cylinder Set for Systema PTW \/ CTW \/ STW M4 Series ( M140 \/ Red )","description":"\u003ch1 data-start=\"0\" data-end=\"83\"\u003eA\u0026amp;K Cylinder Set — Precision Upgrade for Systema PTW \/ CTW \/ STW M4 Series (M140)\u003c\/h1\u003e\r\n\u003cp data-start=\"85\" data-end=\"607\"\u003eTake your PTW\/CTW\/STW-style M4 AEG to the next level with the \u003cstrong data-start=\"147\" data-end=\"167\"\u003eA\u0026amp;K Cylinder Set\u003c\/strong\u003e — a drop-in precision cylinder assembly engineered for high-power builds and rock-solid consistency. CNC-machined components, a vacuum piston design, and high-grade materials combine to deliver dependable high FPS performance, smooth operation, and easy tuning. If you’re building a competition-level AEG or a high-performance DMR platform, this cylinder set gives you the mechanical foundation to hit a tight, predictable velocity window.\u003c\/p\u003e\r\n\r\n\u003ch2 data-start=\"609\" data-end=\"641\"\u003eWhy this cylinder set matters\u003c\/h2\u003e\r\n\u003cp data-start=\"642\" data-end=\"1123\"\u003eMany high-powered AEGs suffer from inconsistent FPS, poor air efficiency, or fragile internals when pushed beyond stock spec. The A\u0026amp;K Cylinder Set is purpose-built to solve those problems: it’s a fully assembled unit using high-quality aluminum and steel parts, machined to tight tolerances for repeatable seals and friction-minimized operation. The result is smoother cycling, better air efficiency, and a reliable FPS band when paired with appropriate springs and battery setups.\u003c\/p\u003e\r\n\r\n\u003ch2 data-start=\"1125\" data-end=\"1176\"\u003ePrecision CNC construction and premium materials\u003c\/h2\u003e\r\n\u003cp data-start=\"1177\" data-end=\"1597\"\u003eAll major components are CNC machined to ensure concentricity and exact fitment. The cylinder body, piston head, and related hardware use high-quality aluminum and steel where strength and dimensional accuracy matter, while select polymer pieces provide impact resilience and weight savings. This hybrid-material approach gives you a durable assembly that resists deformation under sustained high-stress firing and heat.\u003c\/p\u003e\r\n\r\n\u003ch2 data-start=\"1599\" data-end=\"1654\"\u003eVacuum piston design — accurate, tunable, and stable\u003c\/h2\u003e\r\n\u003cp data-start=\"1655\" data-end=\"2091\"\u003eA key feature is the \u003cstrong data-start=\"1676\" data-end=\"1700\"\u003evacuum piston design\u003c\/strong\u003e, which provides a flexible, airtight seal that can be fine-tuned for your build. Unlike one-size-fits-all pistons, this design enables more consistent compression across shots and easier tuning for specific spring strengths and barrel\/hopup combinations. The vacuum piston improves air management, reducing shot-to-shot variance and stabilizing velocity even under extended strings of fire.\u003c\/p\u003e\r\n\r\n\u003ch2 data-start=\"2093\" data-end=\"2127\"\u003eFully assembled for convenience\u003c\/h2\u003e\r\n\u003cp data-start=\"2128\" data-end=\"2509\"\u003eThe A\u0026amp;K Cylinder Set ships fully assembled and ready to drop into compatible PTW\/CTW\/STW M4-type gearboxes, saving you time and eliminating common assembly errors. Because it’s pre-assembled from matched, tested components, you get a trustworthy starting point for additional upgrades (gears, motor, hop-up, barrel) without the guesswork of piecing together parts of mixed origins.\u003c\/p\u003e\r\n\r\n\u003ch2 data-start=\"2511\" data-end=\"2538\"\u003ePerformance expectations\u003c\/h2\u003e\r\n\u003cp data-start=\"2539\" data-end=\"2991\"\u003eWhen paired with an \u003cstrong data-start=\"2559\" data-end=\"2574\"\u003eM140 spring\u003c\/strong\u003e and driven by an \u003cstrong data-start=\"2592\" data-end=\"2614\"\u003e11.1V 5000mAh LiPo\u003c\/strong\u003e, you can expect an FPS range of roughly \u003cstrong data-start=\"2655\" data-end=\"2670\"\u003e490–500 FPS\u003c\/strong\u003e (field-dependent; chrono and ambient conditions will affect actual readings). This power band is suitable for DMR-style play and field builds that require high terminal energy while still prioritizing consistency and reliability. The cylinder’s vacuum piston helps maintain that window even during rapid follow-up shots.\u003c\/p\u003e\r\n\r\n\u003ch2 data-start=\"2993\" data-end=\"3021\"\u003eCompatibility and fitment\u003c\/h2\u003e\r\n\u003cp data-start=\"3022\" data-end=\"3118\"\u003eDesigned specifically for Systema-style platforms and compatible models, this cylinder set fits:\u003c\/p\u003e\r\n\r\n\u003cul data-start=\"3119\" data-end=\"3290\"\u003e\r\n \t\u003cli data-start=\"3119\" data-end=\"3156\"\u003e\r\n\u003cp data-start=\"3121\" data-end=\"3156\"\u003eSystema PTW \/ CTW \/ STW M4 series\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n \t\u003cli data-start=\"3157\" data-end=\"3227\"\u003e\r\n\u003cp data-start=\"3159\" data-end=\"3227\"\u003eA\u0026amp;K M4-style AEGs using the Systema-compatible gearbox form factor\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n \t\u003cli data-start=\"3228\" data-end=\"3290\"\u003e\r\n\u003cp data-start=\"3230\" data-end=\"3290\"\u003eOther AEG rifles that share the PTW\/CTW\/STW gearbox geometry\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp data-start=\"3292\" data-end=\"3474\"\u003eBefore purchasing, verify your gearbox model matches Systema\/PTW geometries; this ensures correct alignment with your piston rails, cylinder head seating, and tappet plate interface.\u003c\/p\u003e\r\n\r\n\u003ch2 data-start=\"3476\" data-end=\"3507\"\u003eInstallation and tuning tips\u003c\/h2\u003e\r\n\u003cul data-start=\"3508\" data-end=\"4075\"\u003e\r\n \t\u003cli data-start=\"3508\" data-end=\"3685\"\u003e\r\n\u003cp data-start=\"3510\" data-end=\"3685\"\u003eBecause the unit is fully assembled, installation is straightforward for anyone comfortable opening a gearbox. Check shimming, motor height, and gear mesh when reassembling.\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n \t\u003cli data-start=\"3686\" data-end=\"3790\"\u003e\r\n\u003cp data-start=\"3688\" data-end=\"3790\"\u003ePair with high-quality seals (or verify the included seal) and a tight bore barrel for best results.\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n \t\u003cli data-start=\"3791\" data-end=\"3913\"\u003e\r\n\u003cp data-start=\"3793\" data-end=\"3913\"\u003eUse the M140 spring for the stated FPS range; if you change spring strength, re-chrono and re-tune hop-up accordingly.\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n \t\u003cli data-start=\"3914\" data-end=\"4075\"\u003e\r\n\u003cp data-start=\"3916\" data-end=\"4075\"\u003eEnsure your battery and motor can reliably cycle the heavier spring—11.1V LiPo and a high-torque motor are recommended to hit the target ROF and prevent stall.\u003c\/p\u003e\r\n\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003ch2 data-start=\"4077\" data-end=\"4099\"\u003eWho should buy this\u003c\/h2\u003e\r\n\u003cp data-start=\"4100\" data-end=\"4459\"\u003eChoose the A\u0026amp;K Cylinder Set if you’re building a high-power, high-consistency M4 platform for DMR or serious field play, and you want a reliable, pre-assembled cylinder designed for Systema-compatible gearboxes. It’s ideal for builders who value accurate tolerances, easy drop-in installation, and a tunable vacuum piston system to stabilize their FPS window.\u003c\/p\u003e","brand":"A\u0026amp;K Airsoft","offers":[{"title":"Default Title","offer_id":47468101927142,"sku":null,"price":135.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0793\/6393\/2390\/files\/ab76d917-CY-PPS-red__16804.jpg?v=1774002138","url":"https:\/\/ngrwzj-i1.myshopify.com\/products\/a-k-cylinder-set-for-systema-ptw-ctw-stw-m4-series-m140-red-1","provider":"CQC Airsoft ","version":"1.0","type":"link"}