{"product_id":"emg-x-retro-arms-cz-billet-cnc-8mm-ver-2-gearbox-shell-for-m4-m16-series-2","title":"EMG x Retro Arms CZ Billet CNC 8mm Ver.2 Gearbox Shell for M4 \/ M16 Series Airsoft AEG Rifles","description":"\u003cp data-start=\"620\" data-end=\"1102\"\u003eThe \u003cstrong data-start=\"624\" data-end=\"686\"\u003eEMG x Retro Arms CZ Billet CNC 8mm Version 2 Gearbox Shell\u003c\/strong\u003e represents the ultimate upgrade for serious Airsoft builders who demand performance, precision, and durability. Crafted through a collaboration between \u003cstrong data-start=\"839\" data-end=\"874\"\u003eEMG (Evike Manufacturing Group)\u003c\/strong\u003e and \u003cstrong data-start=\"879\" data-end=\"896\"\u003eRetro Arms CZ\u003c\/strong\u003e, this gearbox is a masterpiece of engineering — precision-machined from a single block of \u003cstrong data-start=\"987\" data-end=\"1030\"\u003eEN AW 7075 T651 aircraft-grade aluminum\u003c\/strong\u003e, giving it strength far beyond traditional cast or die-forged shells.\u003c\/p\u003e\n\u003cp data-start=\"1104\" data-end=\"1511\"\u003eThis is not your average gearbox. Designed to handle \u003cstrong data-start=\"1157\" data-end=\"1210\"\u003eextreme builds and high-stress performance setups\u003c\/strong\u003e, the EMG x Retro Arms CZ Gearbox is capable of withstanding M160 spring loads without showing signs of fatigue or structural failure. Whether you’re fine-tuning your AEG for high-speed or high-torque builds, this shell gives you the solid foundation you need for reliable, long-lasting performance.\u003c\/p\u003e\n\u003chr data-start=\"1513\" data-end=\"1516\"\u003e\n\u003ch3 data-start=\"1518\" data-end=\"1564\"\u003e\u003cstrong data-start=\"1522\" data-end=\"1562\"\u003eUnmatched CNC Precision and Strength\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1566\" data-end=\"1975\"\u003eEach gearbox shell is \u003cstrong data-start=\"1588\" data-end=\"1614\"\u003eprecision CNC-machined\u003c\/strong\u003e from a billet block of \u003cstrong data-start=\"1638\" data-end=\"1666\"\u003eEN AW 7075 T651 aluminum\u003c\/strong\u003e, one of the strongest aluminum alloys available, commonly used in aerospace and military-grade applications. This billet machining process ensures \u003cstrong data-start=\"1814\" data-end=\"1851\"\u003eunparalleled dimensional accuracy\u003c\/strong\u003e, rigidity, and a perfect fit for internal components — key factors for consistent performance and reduced wear over time.\u003c\/p\u003e\n\u003cp data-start=\"1977\" data-end=\"2234\"\u003eThe \u003cstrong data-start=\"1981\" data-end=\"2008\"\u003edurable anodized finish\u003c\/strong\u003e not only enhances corrosion resistance but also gives the shell a premium matte look worthy of its engineering pedigree. Every shell is \u003cstrong data-start=\"2145\" data-end=\"2181\"\u003elaser-engraved with the EMG logo\u003c\/strong\u003e, a mark of authenticity and quality craftsmanship.\u003c\/p\u003e\n\u003chr data-start=\"2236\" data-end=\"2239\"\u003e\n\u003ch3 data-start=\"2241\" data-end=\"2284\"\u003e\u003cstrong data-start=\"2245\" data-end=\"2282\"\u003eReinforced for High-Stress Builds\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2286\" data-end=\"2588\"\u003eUnlike standard cast gearboxes that can crack under heavy spring tension, the Retro Arms CZ design reinforces \u003cstrong data-start=\"2396\" data-end=\"2417\"\u003ekey stress points\u003c\/strong\u003e to handle the most demanding builds. The gearbox has been \u003cstrong data-start=\"2476\" data-end=\"2516\"\u003eextensively tested with M160 springs\u003c\/strong\u003e — an impressive testament to its durability and mechanical integrity.\u003c\/p\u003e\n\u003cp data-start=\"2590\" data-end=\"2890\"\u003eThe \u003cstrong data-start=\"2594\" data-end=\"2627\"\u003epre-radiused cylinder windows\u003c\/strong\u003e further distribute stress evenly, minimizing cracking risks and extending the shell’s lifespan. Combined with \u003cstrong data-start=\"2738\" data-end=\"2774\"\u003estainless steel connecting bolts\u003c\/strong\u003e and precision tolerances, this gearbox remains rock solid even under the heaviest loads or fastest rates of fire.\u003c\/p\u003e\n\u003chr data-start=\"2892\" data-end=\"2895\"\u003e\n\u003ch3 data-start=\"2897\" data-end=\"2939\"\u003e\u003cstrong data-start=\"2901\" data-end=\"2937\"\u003eQuick-Change Spring Guide System\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2941\" data-end=\"3251\"\u003eOne of the standout features of this gearbox is its \u003cstrong data-start=\"2993\" data-end=\"3042\"\u003eQuick-Change Ball Bearing Spring Guide System\u003c\/strong\u003e. Unlike traditional designs that require full disassembly to swap springs, this mechanism allows you to \u003cstrong data-start=\"3147\" data-end=\"3180\"\u003echange your spring in minutes\u003c\/strong\u003e — perfect for tuning FPS limits or optimizing for field regulations.\u003c\/p\u003e\n\u003cp data-start=\"3253\" data-end=\"3418\"\u003eThis feature is especially valuable for players who alternate between CQB and outdoor environments, allowing effortless transitions between different power levels.\u003c\/p\u003e\n\u003chr data-start=\"3420\" data-end=\"3423\"\u003e\n\u003ch3 data-start=\"3425\" data-end=\"3469\"\u003e\u003cstrong data-start=\"3429\" data-end=\"3467\"\u003eOptimized Design and Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"3471\" data-end=\"3691\"\u003eEvery aspect of the EMG x Retro Arms CZ gearbox is optimized for functionality and user convenience. The \u003cstrong data-start=\"3576\" data-end=\"3600\"\u003edeeper wire channels\u003c\/strong\u003e along the base provide easier cable routing and protect your wiring during installation.\u003c\/p\u003e\n\u003cp data-start=\"3693\" data-end=\"4021\"\u003eThe \u003cstrong data-start=\"3697\" data-end=\"3734\"\u003e8mm bearing\/bushing compatibility\u003c\/strong\u003e allows smoother gear rotation and enhanced mechanical efficiency — a must-have for high-performance setups. This gearbox is compatible with \u003cstrong data-start=\"3875\" data-end=\"3903\"\u003eTokyo Marui, G\u0026amp;P, Matrix\u003c\/strong\u003e, and other \u003cstrong data-start=\"3915\" data-end=\"3948\"\u003eM4 \/ M16 Series AEG platforms\u003c\/strong\u003e (minor modification may be required depending on your specific model).\u003c\/p\u003e\n\u003chr data-start=\"4023\" data-end=\"4026\"\u003e\n\u003ch3 data-start=\"4028\" data-end=\"4069\"\u003e\u003cstrong data-start=\"4032\" data-end=\"4067\"\u003eProfessional-Grade Construction\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"4071\" data-end=\"4343\"\u003eThis gearbox shell is designed for experienced Airsoft technicians, builders, and enthusiasts who demand the best. The tight tolerances and robust construction make it ideal for pairing with high-end internals, HPA conversions, or DMR builds that push mechanical limits.\u003c\/p\u003e\n\u003cp data-start=\"4345\" data-end=\"4483\"\u003e\u003cstrong data-start=\"4345\" data-end=\"4360\"\u003eDisclaimer:\u003c\/strong\u003e Professional installation is recommended, as fitment may vary depending on manufacturer tolerances and model variations.\u003c\/p\u003e\n\u003chr data-start=\"4485\" data-end=\"4488\"\u003e\n\u003ch3 data-start=\"4490\" data-end=\"4515\"\u003e\u003cstrong data-start=\"4494\" data-end=\"4513\"\u003eSpecifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-start=\"4516\" data-end=\"4931\"\u003e\n\u003cli data-start=\"4516\" data-end=\"4557\"\u003e\n\u003cp data-start=\"4518\" data-end=\"4557\"\u003e\u003cstrong data-start=\"4518\" data-end=\"4535\"\u003eManufacturer:\u003c\/strong\u003e EMG x Retro Arms CZ\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4558\" data-end=\"4611\"\u003e\n\u003cp data-start=\"4560\" data-end=\"4611\"\u003e\u003cstrong data-start=\"4560\" data-end=\"4573\"\u003eMaterial:\u003c\/strong\u003e CNC Billet EN AW 7075 T651 Aluminum\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4612\" data-end=\"4720\"\u003e\n\u003cp data-start=\"4614\" data-end=\"4720\"\u003e\u003cstrong data-start=\"4614\" data-end=\"4632\"\u003eCompatibility:\u003c\/strong\u003e Tokyo Marui, G\u0026amp;P, Matrix, and other M4\/M16 Series AEGs (Modification may be required)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4721\" data-end=\"4751\"\u003e\n\u003cp data-start=\"4723\" data-end=\"4751\"\u003e\u003cstrong data-start=\"4723\" data-end=\"4745\"\u003eBearings\/Bushings:\u003c\/strong\u003e 8mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4752\" data-end=\"4865\"\u003e\n\u003cp data-start=\"4754\" data-end=\"4865\"\u003e\u003cstrong data-start=\"4754\" data-end=\"4767\"\u003eFeatures:\u003c\/strong\u003e Quick-Change Spring Guide, Reinforced Design, Deep Wire Channels, Pre-Radiused Cylinder Windows\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4866\" data-end=\"4895\"\u003e\n\u003cp data-start=\"4868\" data-end=\"4895\"\u003e\u003cstrong data-start=\"4868\" data-end=\"4879\"\u003eFinish:\u003c\/strong\u003e Hard Anodized\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4896\" data-end=\"4931\"\u003e\n\u003cp data-start=\"4898\" data-end=\"4931\"\u003e\u003cstrong data-start=\"4898\" data-end=\"4907\"\u003eLogo:\u003c\/strong\u003e EMG Engraved Branding\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4933\" data-end=\"4936\"\u003e\n\u003ch3 data-start=\"4938\" data-end=\"4991\"\u003e\u003cstrong data-start=\"4942\" data-end=\"4989\"\u003eWhy Choose the EMG x Retro Arms CZ Gearbox?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"4992\" data-end=\"5333\"\u003e✅ Machined from solid billet aluminum for maximum strength\u003cbr data-start=\"5050\" data-end=\"5053\"\u003e✅ Reinforced for high-tension springs (tested up to M160)\u003cbr data-start=\"5110\" data-end=\"5113\"\u003e✅ Quick-change spring guide system for rapid tuning\u003cbr data-start=\"5164\" data-end=\"5167\"\u003e✅ Pre-radiused cylinder windows for stress distribution\u003cbr data-start=\"5222\" data-end=\"5225\"\u003e✅ Deep wire channels for cleaner, safer wiring\u003cbr data-start=\"5271\" data-end=\"5274\"\u003e✅ Designed for precision builds and pro-level performance\u003c\/p\u003e\n\u003chr data-start=\"5335\" data-end=\"5338\"\u003e\n\u003ch3 data-start=\"5340\" data-end=\"5359\"\u003e\u003cstrong data-start=\"5344\" data-end=\"5357\"\u003eAbout EMG\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"5360\" data-end=\"5621\"\u003e\u003cstrong data-start=\"5360\" data-end=\"5395\"\u003eEMG (Evike Manufacturing Group)\u003c\/strong\u003e was founded to bring next-level innovation and precision to the Airsoft market. Partnering with leading manufacturers like \u003cstrong data-start=\"5519\" data-end=\"5536\"\u003eRetro Arms CZ\u003c\/strong\u003e, EMG’s goal is to create products that push the limits of performance and realism.\u003c\/p\u003e\n\u003cp data-start=\"5623\" data-end=\"5871\"\u003eWith deep industry knowledge, global partnerships, and a passion for perfection, EMG delivers parts and replicas that stand out in both engineering and quality — products that live up to their promise of \u003cstrong data-start=\"5827\" data-end=\"5869\"\u003e“Manufacturing Excellence in Airsoft.”\u003c\/strong\u003e\u003c\/p\u003e\n","brand":"EMG","offers":[{"title":"Default Title","offer_id":47994902610150,"sku":"18709","price":180.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0793\/6393\/2390\/files\/3543_ra-18709.jpg?v=1784175291","url":"https:\/\/ngrwzj-i1.myshopify.com\/products\/emg-x-retro-arms-cz-billet-cnc-8mm-ver-2-gearbox-shell-for-m4-m16-series-2","provider":"CQC Airsoft ","version":"1.0","type":"link"}