{"product_id":"polarstar-hop-up-thing-chamber-for-aeg-hpa-m4-v2","title":"Polarstar \"Hop Up Thing\" Chamber for AEG\/HPA M4 V2","description":"\u003ch2\u003ePolarstar \"Hop Up Thing\" Chamber for AEG\/HPA M4 V2\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Polarstar \"Hop Up Thing\" Chamber for AEG\/HPA M4 V2 is a precision-machined hop-up chamber designed for standard V2 M4 and M16 airsoft replicas. It is suitable for both conventional AEG builds and HPA conversions, with a focus on consistent adjustment, accurate component fitment and reliable air seal.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe chamber is machined in-house by PolarStar from 6061-T6 aluminium. Unlike cast hop-up chambers, the Hop Up Thing is manufactured to tolerances of approximately ±0.002 inches, or ±0.051 mm. The precise construction helps reduce dimensional variation that could otherwise affect nozzle alignment, inner-barrel fit and hop-up performance.\u003c\/p\u003e\n\n\u003ch3\u003eTDC adjustment for consistent hop\u003c\/h3\u003e\n\n\u003cp\u003eThe chamber uses PolarStar’s TDC, or Top Dead Center, slider system. The adjustment mechanism applies pressure vertically through the nub onto the hop-up bucking, helping keep the pressure centred over the inner barrel.\u003c\/p\u003e\n\n\u003cp\u003eA correctly centred and repeatable adjustment supports consistent backspin and a predictable BB flight path. The system is compatible with 3 × 4 mm hop-up nubs, and a matching round nub is included with the chamber.\u003c\/p\u003e\n\n\u003ch3\u003eDesigned for AEG and HPA builds\u003c\/h3\u003e\n\n\u003cp\u003eThe Hop Up Thing is designed for standard V2 M4 and M16 replicas with either an AEG gearbox or an HPA conversion. The included 0.305-inch gearbox lip is the standard size used in many V2 AEG installations.\u003c\/p\u003e\n\n\u003cp\u003eThe modular gearbox interface allows the fitment of the chamber to be adapted for different builds. The included barrel-shimming O-rings can be used during installation to adjust the position and reduce unwanted movement between the chamber, inner barrel and surrounding components.\u003c\/p\u003e\n\n\u003cp\u003eCompatibility and final fitment still depend on the dimensions of the replica, gearbox shell, nozzle, inner barrel and hop-up bucking. The feeding, air seal and BB drop test should always be checked after installation.\u003c\/p\u003e\n\n\u003ch3\u003eCompatible with PolarStar Direct Attachment\u003c\/h3\u003e\n\n\u003cp\u003eThe Hop Up Thing is also the required hop-up chamber for the PolarStar Direct Attachment system. Direct Attachment allows a compatible PolarStar F2 or JACK HPA engine to connect mechanically to the chamber, creating a rigid assembly consisting of the HPA engine, hop-up chamber and inner barrel.\u003c\/p\u003e\n\n\u003cp\u003eThe included standard gearbox lip is removed for a Direct Attachment installation. The hop-up chamber is then connected using an engine-specific conversion set:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003ePolarStar F2 Direct Attachment Conversion Set for the PolarStar F2\u003c\/li\u003e\n\u003cli\u003ePolarStar JACK Direct Attachment Conversion Set for the PolarStar JACK\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe Direct Attachment conversion sets are sold separately. The Hop Up Thing cannot be connected directly to an F2 or JACK engine without the correct conversion set.\u003c\/p\u003e\n\n\u003ch3\u003eSecure inner-barrel installation\u003c\/h3\u003e\n\n\u003cp\u003eA moulded barrel clip is included to secure the inner barrel to the chamber. Five shimming O-rings are also supplied for adjusting fitment and minimising movement in the installed assembly.\u003c\/p\u003e\n\n\u003cp\u003ePolarStar also includes an ARO tool to assist with the installation of the small retaining O-rings used in the adjustment mechanism.\u003c\/p\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eStandard V2 M4 and M16 airsoft replicas\u003c\/li\u003e\n\u003cli\u003eSuitable for AEG and HPA builds\u003c\/li\u003e\n\u003cli\u003eIncludes a 0.305\" gearbox lip used in many standard AEG installations\u003c\/li\u003e\n\u003cli\u003eCompatible with 3 × 4 mm hop-up nubs\u003c\/li\u003e\n\u003cli\u003eCompatible with PolarStar F2 Direct Attachment when the F2 conversion set is used\u003c\/li\u003e\n\u003cli\u003eCompatible with PolarStar JACK Direct Attachment when the JACK conversion set is used\u003c\/li\u003e\n\u003cli\u003eDirect Attachment conversion sets are sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation notes\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eCheck that the hop-up chamber fits correctly in the selected receiver and outer barrel.\u003c\/li\u003e\n\u003cli\u003eConfirm that the nozzle enters the chamber centrally and to the correct depth.\u003c\/li\u003e\n\u003cli\u003eCheck magazine fitment and BB feeding before using the replica.\u003c\/li\u003e\n\u003cli\u003ePerform a BB drop test after installing the inner barrel and hop-up bucking.\u003c\/li\u003e\n\u003cli\u003eMake sure the hop-up bucking lips do not extend too far into the feed path.\u003c\/li\u003e\n\u003cli\u003eUse the included shimming O-rings as required to minimise unwanted movement.\u003c\/li\u003e\n\u003cli\u003eDirect Attachment installation requires a separately sold F2 or JACK conversion set.\u003c\/li\u003e\n\u003cli\u003eInstallation and compatibility checks should be performed by a person familiar with airsoft internals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003ePrecision-machined hop-up chamber for V2 M4 and M16 replicas\u003c\/li\u003e\n\u003cli\u003eSuitable for both AEG and HPA builds\u003c\/li\u003e\n\u003cli\u003eMachined from 6061-T6 aluminium\u003c\/li\u003e\n\u003cli\u003eManufacturing tolerances of approximately ±0.002\" \/ ±0.051 mm\u003c\/li\u003e\n\u003cli\u003eTDC slider adjustment applies pressure vertically onto the hop-up bucking\u003c\/li\u003e\n\u003cli\u003eCompatible with 3 × 4 mm hop-up nubs\u003c\/li\u003e\n\u003cli\u003eModular and removable gearbox interface\u003c\/li\u003e\n\u003cli\u003eCompatible with PolarStar Direct Attachment conversion sets\u003c\/li\u003e\n\u003cli\u003eMoulded inner-barrel clip\u003c\/li\u003e\n\u003cli\u003eShimming O-rings included for fitment adjustment\u003c\/li\u003e\n\u003cli\u003eManufactured in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage contents\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003ePolarStar Hop Up Thing chamber\u003c\/li\u003e\n\u003cli\u003e0.305\" gearbox lip\u003c\/li\u003e\n\u003cli\u003e3 × 4 mm round hop-up nub\u003c\/li\u003e\n\u003cli\u003eARO retaining O-ring installation tool\u003c\/li\u003e\n\u003cli\u003e5 barrel-shimming O-rings\u003c\/li\u003e\n\u003cli\u003eMoulded inner-barrel clip\u003c\/li\u003e\n\u003cli\u003eRequired adjustment and assembly components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNot included\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eInner barrel\u003c\/li\u003e\n\u003cli\u003eHop-up bucking\u003c\/li\u003e\n\u003cli\u003eAEG gearbox or HPA engine\u003c\/li\u003e\n\u003cli\u003ePolarStar F2 Direct Attachment Conversion Set\u003c\/li\u003e\n\u003cli\u003ePolarStar JACK Direct Attachment Conversion Set\u003c\/li\u003e\n\u003cli\u003eReplica or other components shown in product images\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eManufacturer: PolarStar\u003c\/li\u003e\n\u003cli\u003eProduct: Hop Up Thing Chamber for AEG\/HPA M4 V2\u003c\/li\u003e\n\u003cli\u003eProduct type: adjustable hop-up chamber\u003c\/li\u003e\n\u003cli\u003eCompatibility: standard V2 M4\/M16 AEG and HPA replicas\u003c\/li\u003e\n\u003cli\u003eMaterial: machined 6061-T6 aluminium\u003c\/li\u003e\n\u003cli\u003eManufacturing tolerance: approximately ±0.002\" \/ ±0.051 mm\u003c\/li\u003e\n\u003cli\u003eHop-up adjustment: TDC slider system\u003c\/li\u003e\n\u003cli\u003eCompatible nub size: 3 × 4 mm\u003c\/li\u003e\n\u003cli\u003eIncluded gearbox lip: 0.305\"\u003c\/li\u003e\n\u003cli\u003eColour: Medical Metal Gray\u003c\/li\u003e\n\u003cli\u003eManufactured in: USA\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PolarStar Engineering \u0026 Machine, LLC","offers":[{"title":"Default Title","offer_id":58559019483484,"sku":"10001406","price":1001.0,"currency_code":"SEK","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/6636\/2610\/files\/PolarStar_Hop_Up_Thing_and_accessories.webp?v=1786020855","url":"https:\/\/atom-airsoft.fi\/en-se\/products\/polarstar-hop-up-thing-chamber-for-aeg-hpa-m4-v2","provider":"Atom Airsoft","version":"1.0","type":"link"}