{"product_id":"4uantum-magnus-pro-mcx-tdc-hop-up-chamber","title":"4UANTUM Magnus Pro MCX TDC Hop-Up Chamber - APFG MCX","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\u003cstrong style=\"color:#1a6b3a;\"\u003e4UANTUM Magnus Pro MCX - a one-piece billet TDC chamber that fixes the APFG MCX nozzle-wear problem while it is at it.\u003c\/strong\u003e\u003c\/div\u003e\n\u003cp\u003eTDC - top dead centre - adjustment is the difference between a hop that pushes the BB straight up and one that pushes it slightly off to one side. On a stock chamber you tune hop and hope the contact point is centred. With true TDC you set that contact point deliberately, and your groups stop drifting left or right at range.\u003c\/p\u003e\n\u003cp\u003eThe Magnus Pro is machined from a \u003cstrong\u003esingle billet of 6061 aluminium as a one-piece housing\u003c\/strong\u003e, with 4UANTUM's self-centering tri-lug design holding the barrel concentric. On most platforms that rigidity is simply a nice-to-have. On the APFG MCX it matters considerably more, because the hop chamber forms part of the barrel-mounting interface - so a stronger, more precisely machined chamber stiffens the entire front end rather than just the hop.\u003c\/p\u003e\n\u003cp\u003eIt also corrects a genuine weakness in the platform. The Magnus Pro's \u003cstrong\u003erevised cycling geometry interfaces with the bolt carrier rather than the nozzle\u003c\/strong\u003e, so the nozzle stops taking repeated impact every cycle. If you have run an APFG MCX hard and watched the nozzle wear, that is the fix.\u003c\/p\u003e\n\u003cp\u003eDay to day, the adjustment wheel sits where you can reach it through the handguard openings, so hop changes are a quick turn between engagements rather than a strip-down with tools.\u003c\/p\u003e\n\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eCompatibility - read before ordering\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;\"\u003eFits\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAPFG MCX GBB series - Rattler, Legacy, SPEAR LT, Rattler LT, RSAR, SURG and MCX HUNTER\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAlso fits\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eBPW MCX GBB series, where built on the APFG MCX GBB system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eDoes NOT fit\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAPFG XM7 (SPEAR) GBB - different hop-up design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eDoes NOT fit\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAPFG MPX GBB series - different hop-up design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eDoes NOT fit\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eMCX GBB rifles from other brands - APFG platform only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eDoes NOT fit\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eAny non-MCX GBB model\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eInner barrels\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eJapanese-specification precision inner barrels, including PDI, KM and Laylax, are NOT applicable without additional machining\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eThe naming catches people out.\u003c\/strong\u003e The \u003cem\u003eSPEAR LT\u003c\/em\u003e is an MCX-platform rifle and is compatible. The \u003cem\u003eXM7, also called the SPEAR\u003c\/em\u003e, is a different rifle with a different hop design and is not. Check which you actually own before ordering.\u003c\/p\u003e\n\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eSpecifications\u003c\/h2\u003e\n\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;\"\u003eTDC hop-up chamber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eMagnus Pro MCX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\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;\"\u003eAPFG MCX GBB series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003e6061 aluminium, machined from a single billet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eConstruction\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eOne-piece housing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eBarrel alignment\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eSelf-centering tri-lug design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\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;\"\u003eTrue TDC mechanism, wheel accessible through the handguard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eCycling\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eInterfaces with the bolt carrier rather than the nozzle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eSupplier code\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eTDC-005\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;\"\u003e4UANTUM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eGood to know before you buy\u003c\/h2\u003e\u003cp\u003eCheck your exact model against the compatibility table above - the MCX family has several rifles with different hop designs, and the SPEAR naming in particular is easy to get wrong. If you are running a Japanese-specification inner barrel such as PDI, KM or Laylax, it will not fit without additional machining, so budget for a compatible barrel too. Fitting means stripping the front end, and it is worth re-tuning hop from scratch afterwards rather than trying to carry over an old setting.\u003c\/p\u003e\n\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does TDC adjustment actually give me?\u003c\/strong\u003e\u003cbr\u003eIt lets you set where the bucking contacts the BB, not just how hard. A hop that is slightly off-centre pushes the BB sideways as well as up, which is what causes groups to drift left or right at distance. TDC removes that.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit my APFG SPEAR?\u003c\/strong\u003e\u003cbr\u003eThat depends which SPEAR. The \u003cstrong\u003eMCX SPEAR LT\u003c\/strong\u003e is compatible. The \u003cstrong\u003eXM7, also sold as the SPEAR\u003c\/strong\u003e, is not - it uses a different hop-up design. Send us the exact model if you are unsure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit an MCX from another brand?\u003c\/strong\u003e\u003cbr\u003eNo. It is machined for the APFG MCX platform specifically, and MCX replicas from other manufacturers use different internal dimensions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I keep my Laylax inner barrel?\u003c\/strong\u003e\u003cbr\u003eNo. Japanese-specification precision barrels including PDI, KM and Laylax use different slot dimensions and are not applicable without additional machining.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does it stop nozzle damage?\u003c\/strong\u003e\u003cbr\u003eThe chamber is designed so the cycling action bears against the bolt carrier rather than the nozzle. On a stock APFG MCX the nozzle absorbs that impact every shot, which wears it over time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need tools to adjust the hop?\u003c\/strong\u003e\u003cbr\u003eNo. The adjustment wheel is reachable through the handguard openings, so you can make incremental changes in the field without disassembly.\u003c\/p\u003e\n\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\u003eFitting:\u003c\/strong\u003e this replaces the hop chamber, which on the APFG MCX also forms part of the barrel mount - so it is a front-end strip rather than a quick swap. We fit and tune these in the workshop through the \u003ca href=\"\/products\/hpa-tech-service-booking\" style=\"color:#1B3A6B;\"\u003etech service\u003c\/a\u003e if you would rather not.\u003c\/div\u003e\n\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 \u003ca href=\"\/products\/4uantum-friction-pro-high-performance-gbb-bucking\" style=\"color:#cdd6f4;\"\u003e4UANTUM Friction Pro GBB bucking\u003c\/a\u003e to get the most from the TDC adjustment, or see our \u003ca href=\"\/collections\/hop-up-units-hop-rubbers\" style=\"color:#cdd6f4;\"\u003ehop-up range\u003c\/a\u003e. Unsure of your model? \u003ca href=\"https:\/\/wa.me\/447874452357\" style=\"color:#cdd6f4;\"\u003emessage us on WhatsApp\u003c\/a\u003e and we will confirm the fit.\u003c\/div\u003e","brand":"4UANTUM","offers":[{"title":"Default Title","offer_id":55634197283192,"sku":"6552488526","price":134.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0562\/8097\/3450\/files\/4UANTUMMagnusProMCXTDCHopChamber_TitanForge-2.webp?v=1787049328","url":"https:\/\/www.titanforgeairsoft.com\/products\/4uantum-magnus-pro-mcx-tdc-hop-up-chamber","provider":"Titan Forge Airsoft","version":"1.0","type":"link"}