{"product_id":"retroarms-cnc-koneistettu-rataslaatikko-pikajousenvaihdolla-m249-pkm-8mm-musta","title":"Retro Arms CNC-machined gearbox with quick spring change M249\/PKM (8mm) - black","description":"\u003cp\u003eHigh-quality CNC-machined gearbox for CA\/A\u0026amp;K-based \u003cstrong\u003eM249 or PKM\u003c\/strong\u003e airsoft machine guns.\u003c\/p\u003e\n\u003cp\u003eThis gearbox is made from a single solid piece of aircraft-grade aluminum (Dural) \u003cstrong\u003eEN AW 7075 T651\u003c\/strong\u003e, offering unmatched mechanical properties. Dural aircraft aluminum is extremely strong, capable of withstanding stress up to \u003cstrong\u003e590MPa\u003c\/strong\u003e (Ultimate Tensile Strength) before breaking. In comparison, standard tool steel withstands up to \u003cstrong\u003e390MPa\u003c\/strong\u003e. Thanks to the Dural material, Retro Arms CNC gearboxes are far superior in durability and quality compared to standard zinc-aluminum cast gearboxes.\u003c\/p\u003e\n\u003cp\u003ePackage includes:\u003cbr\u003e\n- CNC Gearbox M249\/PKM (8mm) QSC\u003cbr\u003e\n- Screw set\u003c\/p\u003e\n\u003cp\u003eRetro Arms improvements over the standard CNC M249\/PKM gearbox:\u003c\/p\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli\u003eInternal spring slots are grooved to prevent the tappet plate spring from accidentally coming loose.\u003c\/li\u003e\n\u003cli\u003eBearing seats are sized -0.02mm (7.98mm) smaller to prevent bearings from rotating in the seat. Edges of the bearing seats are rounded for easier installation.\u003c\/li\u003e\n\u003cli\u003eAll sharp edges are rounded to maximize durability, as sharp corners create stress peaks under load.\u003c\/li\u003e\n\u003cli\u003eGearbox halves fit precisely together thanks to CNC-milled alignment grooves.\u003c\/li\u003e\n\u003cli\u003eThe gearbox has been redesigned in critical areas for increased strength.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRetro Arms gearboxes feature a \u003cstrong\u003eQuick Spring Change (QSC) system\u003c\/strong\u003e, allowing the spring to be replaced through a rear plug using a hex key without fully disassembling the gearbox.\u003c\/p\u003e","brand":"Retro Arms","offers":[{"title":"Default Title","offer_id":54236716794204,"sku":"6390","price":1643.05,"currency_code":"NOK","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/6636\/2610\/files\/29469.png?v=1743366397","url":"https:\/\/atom-airsoft.fi\/en-no\/products\/retroarms-cnc-koneistettu-rataslaatikko-pikajousenvaihdolla-m249-pkm-8mm-musta","provider":"Atom Airsoft","version":"1.0","type":"link"}