{"product_id":"mechlabs-xx-mod-bolt","title":"MechLabs XX-Mod Bolt — Adjustable Nozzle for XX-Mod, NEXXUS and ARC","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;\"\u003eMechLabs XX-Mod Bolt — more shots per tank, and a nozzle you set to your own hop chamber.\u003c\/strong\u003e Engineered for the XX-Mod, and cross-compatible with NEXXUS and ARC.\u003c\/div\u003e\u003cp\u003eThe bolt is where an HPA engine spends its air, so it is also where the gains hide. The XX-Mod Bolt reduces air consumption per shot, which means \u003cstrong\u003emore shots per tank\u003c\/strong\u003e without changing how the gun performs.\u003c\/p\u003e\u003cp\u003eThat lower demand pays off twice. Because it needs less volume during rapid fire, it stays stable on \u003cstrong\u003elower-flow third-party regulators and tank presets\u003c\/strong\u003e that would otherwise fall behind. If your regulator is not a high-flow unit, this is the part that makes the difference.\u003c\/p\u003e\u003cp\u003eThe \u003cstrong\u003eadjustable nozzle\u003c\/strong\u003e is the headline. Rather than living with a fixed length, you set the nozzle to sit precisely in your hop-up chamber — which improves grouping and output stability, and synchronises the internal air-cycle rate to deliver the right air volume for your nozzle length and configuration.\u003c\/p\u003e\u003cp\u003eIt also minimises the shot-down effect, so the transition from semi into full auto is smoother with less drop across a burst. And although MechLabs engineered it for the XX-Mod, it is fully cross-tech compatible with the \u003cstrong\u003eNEXXUS and ARC\u003c\/strong\u003e platforms, so owners of those engines get the same air performance.\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;\"\u003eHPA engine bolt with adjustable nozzle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eEngineered for\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eMechLabs XX-Mod\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eCross-compatible\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eNEXXUS and ARC platforms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eNozzle\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAdjustable to fit the hop-up chamber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAir consumption\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eReduced — more shots per tank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eBurst management\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eLower air-volume demand during rapid fire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eRegulators\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eStable on lower-flow third-party regulators and tank presets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eShot-down effect\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eMinimised for smoother semi to auto transition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\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;\"\u003eMechLabs\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 before you buy\u003c\/h2\u003e\u003cp\u003eA component rather than a complete engine, and it is already fitted to a new XX-Mod — so this listing is for upgrading a NEXXUS or ARC, or replacing a worn bolt.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFitting is a straightforward swap\u003c\/strong\u003e — the bolt comes out and the XX-Mod Bolt goes in, with no shimming or modification. The only step that needs care is setting the nozzle to your chamber rather than leaving it at default, because that adjustment is where the grouping and stability gains come from.\u003c\/p\u003e\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill it fit my NEXXUS or ARC?\u003c\/strong\u003e\u003cbr\u003eYes. MechLabs engineered it for the XX-Mod but built it cross-tech compatible with both NEXXUS and ARC.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to fit?\u003c\/strong\u003e\u003cbr\u003eNo. It is a direct swap for the existing bolt with no modification needed. Setting the nozzle length to suit your hop chamber is the part worth taking time over, and we will do it on the bench if you prefer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need it if I have just bought an XX-Mod?\u003c\/strong\u003e\u003cbr\u003eNo, the engine ships with it. This is for NEXXUS and ARC owners wanting the same air performance, or to replace a worn one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much air will it actually save?\u003c\/strong\u003e\u003cbr\u003eMechLabs do not publish a percentage. What they do state is that lower volume demand keeps it stable on lower-flow regulators, which is the benefit most people notice in practice.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does adjusting the nozzle achieve?\u003c\/strong\u003e\u003cbr\u003eIt sets the fit into your hop-up chamber precisely, improving grouping and output stability, and syncs the air-cycle rate to your nozzle length.\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⚠ \u003cstrong\u003eRunning HPA:\u003c\/strong\u003e always feed an engine through a secondary regulator and never connect it directly to a tank output. Check the rated pressure before setting a regulator, and chronograph to your site limit before playing.\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 see the \u003ca href=\"\/products\/mechlabs-xx-mod-fully-mechanical-hpa-engine-for-v2-gearbox\" style=\"color:#cdd6f4;\"\u003eXX-Mod engine\u003c\/a\u003e it was built for, or the full \u003ca href=\"\/collections\/hpa-engines\" style=\"color:#cdd6f4;\"\u003eHPA engine range\u003c\/a\u003e. As an authorised MechLabs tech centre we fit, tune and service these in house rather than sending them away, or \u003ca href=\"https:\/\/wa.me\/447874452357\" style=\"color:#cdd6f4;\"\u003emessage us on WhatsApp\u003c\/a\u003e.\u003c\/div\u003e","brand":"MechLabs","offers":[{"title":"Default Title","offer_id":55643212644728,"sku":"7665860684","price":84.95,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0562\/8097\/3450\/files\/MechLabsXX-MoldBoltAdjustableNozzle_TitanForgeAirsoft.webp?v=1788284904","url":"https:\/\/www.titanforgeairsoft.com\/products\/mechlabs-xx-mod-bolt","provider":"Titan Forge Airsoft","version":"1.0","type":"link"}