{"title":"Hop Up Thing","description":null,"products":[{"product_id":"a-polarstar-hop-up-thing","title":"A PolarStar Hop Up Thing","description":"\u003ch1 class=\"p1\"\u003e\n\u003cb\u003ePolarStar Hop Up Thing\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\n\u003c\/h1\u003e\n\u003cp class=\"p3\"\u003eBet you can’t guess what this Thing is for. It’s a hop up, or a paperweight, or maybe a very expensive fidget spinner, but we’re pretty sure it’s a hop up. Actually, it's a 6061 T6 Aircraft Aluminum hop up. We know, \"Aircraft Grade\" is the favorite buzzword of every airsoft company trying to make a $15 part sound like it belongs on a SpaceX rocket. But we actually machine these Things in-house at PolarStar to +\/- 0.002\" tolerances because we’re tired of seeing high-end builds ruined by sloppy, off-spec cast parts. They used this stuff for wing spars and fuselage skins, and now you’re using it for your hop up. It’s probably overkill, but \"overkill\" is basically our middle name.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eLook, we could play the industry game and trademark some stupid marketing words or pay a YouTuber to tell you this Thing will magically double your range while they shill you a generic flashlight. PolarStar don’t play that. We designed this with a zero-BS focus on the stuff that actually matters: consistency, fitment, and air-seal. No fluff, no \"proprietary magic,\" just a straight-forward, precision-engineered tool that does exactly what it’s supposed to do every time you pull the trigger.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe heart of this Thing is our TDC (Top Dead Center) slider system. Unlike the old-school sliders that shift if you sneeze on them, our TDC arm applies perfectly vertical pressure for a consistent flight path. \u003c\/p\u003e\n\u003cp data-path-to-node=\"0\"\u003eWe’ve modularized the design so you can actually tune the fitment for both AEG and HPA builds. While we have some serious upgrades in the works—like interchangeable gearbox lips to kill \"mid-cap syndrome\" and barrel slot wing bushings to eliminate rotational wobble—those will be available for purchase down the line as optional accessories. For now, we've focused on the core essentials. If your hop up is snug and your nozzle is centered, your gun shoots straight. It’s not rocket science; it’s just good engineering.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eSPECS:\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li3\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eCompatibility:\u003c\/b\u003e Standard V2 M4\/M16 models (AEG and HPA)\u003c\/li\u003e\n\u003cli class=\"li3\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eMaterial:\u003c\/b\u003e 100% Machined 6061 Aluminum\u003c\/li\u003e\n\u003cli class=\"li3\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eAdjustment:\u003c\/b\u003e TDC Slider System (3x4mm nub compatible)\u003c\/li\u003e\n\u003cli class=\"li3\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eColor:\u003c\/b\u003e Batch 01 - Medical Metal Gray\u003c\/li\u003e\n\u003cli class=\"li3\"\u003e\n\u003cb\u003eManufacturing:\u003c\/b\u003e Made in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eWHAT’S IN THE BOX?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe hop up Thing and the parts to make it work. We’ve included a 0.305” gearbox lip (standard for most AEGs), a 3x4mm round nub, and even an ARO (Axel Retaining O-ring) Tool because we know installing those tiny 1x1mm O-rings is a pain in the ass without the right gear. We also threw in 5 shimming O-rings and a molded barrel clip to keep everything tight.\u003c\/p\u003e\n\u003cp\u003eThis product is \u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003e\u003cem\u003eexcluded\u003c\/em\u003e\u003c\/strong\u003e\u003c\/span\u003e from \u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003e\u003cstrong\u003eall\u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003e discounts.\u003c\/p\u003e\n\u003chr data-path-to-node=\"13\"\u003e\n\u003ch3 data-path-to-node=\"14\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/Hopup_AEG_M4_Exploded_View.pdf?v=1771625677\" target=\"_blank\" title=\"Hop Up Exploded View\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/PStar_Manual_Icon_e15fe2b9-ddbe-484c-ba5c-a1a5a5d52200.png?v=1613177732\" alt=\"\" width=\"213\" height=\"154\" style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/a\u003e\u003c\/h3\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/PolarStar_Hop_Up_Thing_and_accessories.webp?v=1771442747\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg style=\"margin-bottom: 16px; float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/2hopuptinbetter.webp?v=1771442624\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\n\u003cimg style=\"margin-bottom: 16px; float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/6sidehopuplogo.webp?v=1771442624\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/9nologoside3.webp?v=1771442624\" alt=\"\"\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\n\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/10Photoroom_20260218_133414.webp?v=1771442624\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/11Photoroom_20260218_133438.webp?v=1771442624\"\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/DUSAnDgW5hQ?si=cvBjuW0tJn4G_5FU\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e","brand":"PolarStar","offers":[{"title":"Default Title","offer_id":48729171493088,"sku":"10001406","price":74.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/hopupbright.jpg?v=1781622662"},{"product_id":"direct-attachment","title":"PolarStar Direct Attachment","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eThe Alignment Revolution is a Monolithic Assembly.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eIf you've ever spent hours shimming a gearbox shell just to have your nozzle tilt .5mm and ruin your grouping, you know the pain. We got tired of \"good enough\" alignment. So we made this.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe PolarStar Direct Attachment is a replacement for the original front cylinder on your F2 or JACK. \u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eWhat gearbox does this fit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eShort answer: it doesn't exactly need one. The Direct Attachment replaces the front cylinder on your F2 or JACK and connects directly to \u003cmeta charset=\"utf-8\"\u003e \u003ca rel=\"noopener\" href=\"https:\/\/polarstarairsoft.com\/products\/a-polarstar-hop-up-thing\" target=\"_blank\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003eThe PolarStar Hop Up Thing\u003c\/em\u003e\u003c\/span\u003e\u003c\/a\u003e, allowing the engine to mount directly to the hop-up itself. In a traditional gearbox, the upper shell positions and aligns the HPA system with the hop-up. Because the alignment is now built into the Direct Attachment front cylinders, that portion of the gearbox is no longer needed. The electronics, and trigger\/selector system can still be housed in a modified shell, a printed lower, or a completely custom chassis. See the manual below for a more in depth explanation!\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eHow It Works\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eIt's a two-piece system: the Direct Attach Front Cylinder and an internal Adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWhen you thread our Hop Up directly into this assembly, the HPA engine, the hop-up, and the inner barrel become one single, rigid, monolithic unit.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWhy does that matter?\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eZero Nozzle Deflection\u003c\/strong\u003e — By locking everything together, there's no room for the nozzle to wiggle or lean when it's loading a BB.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eConsistency = Groups\u003c\/strong\u003e — If the BB loads exactly the same way every time, the hop-up effect stays consistent. Consistent hop means tighter groupings. It's not magic, it's just better support.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003ePerfect Alignment\u003c\/strong\u003e — It's physically impossible for the nozzle to be misaligned with the bore. If it's crooked, you probably cross-threaded it. Don't do that.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eThe Best Part? We're leaving the rest to you.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWe're using these in our own custom builds, wild 3D-printed projects, and with Monk Customs Oracles to achieve that \"impossible\" perfect alignment. It works. It's solid.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWhether you're dropping this into a standard shell to finally fix a lemon or building a scratch-made sci-fi blaster from a 3D printer, this system is only limited by your imagination.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eNow available. Ships from Newark, DE.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cspan style=\"text-decoration: underline; color: rgb(255, 42, 0);\"\u003e\u003cem\u003eNote: The Direct Attachment Front Cylinder and Adapter are sold as shown. The F2 engine, hop-up, and Monk Oracle shell shown in product images are not included and sold separately.\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/PolarStar_Airsoft_Direct_Attachment_Guide_May_V1.1.pdf?v=1778855640\" title=\"PolarStar Direct Attachment Manual\" rel=\"noopener\" target=\"_blank\"\u003e\u003cspan style=\"text-decoration: underline; color: rgb(255, 42, 0);\"\u003e\u003cem\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/PStar_Manual_Icon_e15fe2b9-ddbe-484c-ba5c-a1a5a5d52200.png?v=1613177732\"\u003e\u003c\/em\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"PolarStar","offers":[{"title":"F2 Direct Attachment","offer_id":51535599468768,"sku":"10001465","price":25.0,"currency_code":"USD","in_stock":true},{"title":"JACK Direct Attachment","offer_id":51535656321248,"sku":"10001490","price":27.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/PolarStar_Direct_Attachment_-_F2_Front_Cylinder_and_Adapter.jpg?v=1777046554"},{"product_id":"hardware-kit-3d-printable-split-gearbox-v2","title":"Hardware Kit, 3D Printable Split Gearbox, V2","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eHardware Kit, 3D Printable Split Gearbox V2\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe PolarStar Hardware Kit includes all required fasteners and components to assemble the free 3D printable V2 gearbox lower — no hardware store runs, no guessing on specs. Print the lower, grab this kit, and build.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eWhat's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\" style=\"width: 100.087%; height: 235.125px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 10.8326%; height: 19.5938px;\"\u003e\u003cstrong\u003eQty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 50.2882%; height: 19.5938px;\"\u003e\u003cstrong\u003ePart\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 38.1786%; height: 19.5938px;\"\u003e\u003cstrong\u003e Purpose\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 10.8326%; height: 19.5938px;\"\u003e4x\u003c\/td\u003e\n\u003ctd style=\"width: 50.2882%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eScrew, BHSC, M3 x 15mm SS\u003c\/td\u003e\n\u003ctd style=\"width: 38.1786%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eClamshell assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 10.8326%; height: 19.5938px;\"\u003e1x\u003c\/td\u003e\n\u003ctd style=\"width: 50.2882%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eScrew, BHSC, M2 x 4mm SS\u003c\/td\u003e\n\u003ctd style=\"width: 38.1786%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eSwitchboard mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 10.8326%; height: 19.5938px;\"\u003e8x\u003c\/td\u003e\n\u003ctd style=\"width: 50.2882%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eHeat Set Insert, M3\u003c\/td\u003e\n\u003ctd style=\"width: 38.1786%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eClamshell + grip screw inserts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 10.8326%; height: 19.5938px;\"\u003e1x\u003c\/td\u003e\n\u003ctd style=\"width: 50.2882%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eHeat Set Insert, M2\u003c\/td\u003e\n\u003ctd style=\"width: 38.1786%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eSwitchboard insert\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 10.8326%; height: 19.5938px;\"\u003e1x\u003c\/td\u003e\n\u003ctd style=\"width: 50.2882%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eSquare Nut, M5\u003c\/td\u003e\n\u003ctd style=\"width: 38.1786%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eBuffer tube screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 10.8326%; height: 19.5938px;\"\u003e1x\u003c\/td\u003e\n\u003ctd style=\"width: 50.2882%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e#23 HSS Drill Bit\u003c\/td\u003e\n\u003ctd style=\"width: 38.1786%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eGrip screw pilot holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 10.8326%; height: 39.1875px;\"\u003e1x\u003c\/td\u003e\n\u003ctd style=\"width: 50.2882%; height: 39.1875px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eCompression Spring\u003c\/td\u003e\n\u003ctd style=\"width: 38.1786%; height: 39.1875px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003ePusher piece — keeps engine seated forward\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 10.8326%; height: 19.5938px;\"\u003e2x\u003c\/td\u003e\n\u003ctd style=\"width: 50.2882%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eBullet Valve Lead, 5\"\u003c\/td\u003e\n\u003ctd style=\"width: 38.1786%; height: 19.5938px;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eHPA line routing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eCompatible With:\u003c\/strong\u003e Free\u003ca href=\"https:\/\/polarstarairsoft.com\/pages\/creator-corner\" rel=\"noopener\" target=\"_blank\"\u003e PolarStar V2 Gearbox Lower files\u003c\/a\u003e — download at \u003ca rel=\"noopener\" href=\"https:\/\/polarstarairsoft.com\/pages\/creator-corner\" target=\"_blank\"\u003epolarstarairsoft.com\/pages\/creator-corner\u003c\/a\u003e or grab the \u003ca rel=\"noopener\" href=\"https:\/\/makerworld.com\/en\/models\/2704357-polarstar-airsoft-3d-printed-split-gearbox#profileId-2998363\" target=\"_blank\"\u003eBambu-ready 3MF on MakerWorld.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e Heat set inserts require a soldering iron set to 200–230°C. Vertical clamshell holes are pre-sized after printing — no drilling needed for those locations. Grip screw pilot holes require the included #23 drill bit before insert installation.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cem\u003eThe free 3D printable gearbox files are required to use this kit. HPA Engine, Direct Attachment Front Cylinder, and Hop Up Thing are sold separately.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003eComplete your build:\u003c\/strong\u003e For a full DA gearbox build you'll also need a selector plate and trigger\/safety assembly. Both are available separately:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/polarstarairsoft.com\/products\/m4-m16-series-selector-plate-gen3-only\" target=\"_blank\"\u003eM4\/M16 Series Selector Plate\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/polarstarairsoft.com\/products\/vfc-m4-m16-series-fusion-engine-small-parts-kit-1\" target=\"_blank\"\u003eVFC M4\/M16 Fusion Engine Small Parts Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/PolarStar_Airsoft_Direct_Attachment_Guide_May_V1.1.pdf?v=1778855640\" title=\"Direct Attachment Guide\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/PStar_Manual_Icon_e15fe2b9-ddbe-484c-ba5c-a1a5a5d52200.png?v=1613177732\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"PolarStar","offers":[{"title":"Default Title","offer_id":52610321154272,"sku":"10001476","price":10.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/HardwareKitMay122026Edited.jpg?v=1778594225"},{"product_id":"hop-up-barrel-slot-bushing-set","title":"Hop Up Barrel Slot Bushing set","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eHop Up Thing — Barrel Slot Bushings\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eStop the wiggle. Lock the hop up in place.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eMost stock hop up units have loose fitment in the outer barrel, leaving room for the hop up to rotate or shift vertically. Rotation sends BBs left or right. Vertical movement throws off loading consistency and nozzle alignment. Either way, your accuracy pays the price.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eBarrel slot bushings eliminate that play entirely. They fill the gap between the barrel slots and the Hop Up Thing wings, removing rotational and vertical movement at the source. Paired with the barrel O-rings pushing the hop up against the gearbox face, the entire assembly becomes effectively stationary relative to both the barrel and the gearbox. The result is a hop up that stays exactly where you put it, shot after shot.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhy this matters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eA hop up that can move is a hop up that cannot be consistent. Eliminating that play means your BB loads the same way every time, your hop up effect stays predictable, and your groupings tighten up.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eFinding your fit\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eOuter barrel slot diameters vary by manufacturer, so each pack includes four sets of bushings covering the most common size range, along with two small Phillips screws for securing them.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eTo find your size, measure your barrel slot diameter with calipers and match it to the closest set. Or skip the measuring and just start with the smallest set, working your way up until the hop up sits snug in the outer barrel.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eEach set is color coded with a reference sticker so you can match diameters listed on the packaging.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhat's in the box:\u003c\/strong\u003e Four sets of barrel slot bushings in varying diameters, two Phillips mounting screws, color coded size reference card.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eCompatible with the PolarStar Hop Up Thing.\u003c\/p\u003e","brand":"PolarStar","offers":[{"title":"Default Title","offer_id":53217628422368,"sku":"10001462","price":14.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/Hop_Up_Barrel_Slot_Bushing_Pack.jpg?v=1782833083"},{"product_id":"barrel-shim-o-rings-10pk","title":"Barrel Shim O-rings, 10pk","description":"\u003cp\u003e10x pack of 8x1.5mm O-rings for barrel shimming\u003c\/p\u003e\n\u003cp\u003eReplacements for if original O-rings were lost, or more O-rings are needed for shimming the barrel.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-teams=\"true\"\u003eThe O-rings are to be installed on the barrel and butted up against the front of the hop-up. The O-rings provide a more rigid option for biasing the hop-up assembly towards the gearbox, ensuring the hop-up will not move away from the nozzle tip during use. This is a common method for stabilizing the hop-up, and works well with other HPA systems, as well as AEG systems.\u003c\/span\u003e\u003c\/p\u003e","brand":"PolarStar","offers":[{"title":"Default Title","offer_id":53271294705888,"sku":"10001468","price":2.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/10Photoroom_20260218_133414.webp?v=1771442624"},{"product_id":"another-polarstar-hop-up-thing-v3","title":"Another PolarStar Hop Up Thing - V3","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eAnother PolarStar Hop Up Thing AK\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003ePrecision-engineered for the AK platform, built in the USA.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe PolarStar AK Hop Up brings true TDC performance and micrometer-style adjustment to your AK build. Whether you're running an AK74, 100 series, RPK, or AK12, this unit is designed to eliminate the guesswork and imprecision that comes standard with most AK hop up systems.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWider range. Finer control.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eUnlike typical AK hop up units, the PolarStar AK Hop Up offers a significantly wider adjustment range without giving up precision. The micrometer-style thread keeps every adjustment fine and repeatable, no more overshooting your ideal hop setting. It's built to work with any hop method you prefer, standard round nub, flat nub, flat hop, or r-hop.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eBuilt into the PolarStar ecosystem\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe removable, threaded gearbox lip and feed tube (3\/8-40) match PolarStar's V2 architecture, so it fits seamlessly if you're already running PolarStar components. The gearbox lip's standard .305\" ID is compatible with most nozzles, including the included AEG nozzle. Looking to go further? The AK Hop Up is also compatible with PolarStar's Direct Attachment Front Cylinders for a fully rigid, monolithic setup.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhat's included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eV3 Hopup body, feed neck, gearbox lip, adjustment wheel, adjustment thread, retainer, mounting hardware, O-rings, barrel bushing, barrel clip, and a standard round nub with dowel pin for extra rigidity.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cem\u003eBucking and barrel not included.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eConfirmed compatible with most LCT AK models, Marui\/JG AK74 models, CYMA AK74 models, and Arcturus PP1901.\u003c\/p\u003e","brand":"PolarStar","offers":[{"title":"Default Title","offer_id":54176148717792,"sku":null,"price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/V3.jpg?v=1786981629"}],"url":"https:\/\/polarstarairsoft.com\/collections\/hop-up-thing.oembed","provider":"PolarStar","version":"1.0","type":"link"}