{"product_id":"action-army-double-o-ring-aeg-piston-head","title":"Action Army Double O-Ring AEG Piston Head","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;\"\u003eAction Army Double O-Ring AEG Piston Head — double sealed, CNC machined, and running on a Japanese ball bearing.\u003c\/strong\u003e Built for power tuned gearboxes where the spring is doing serious work.\n\u003c\/div\u003e\u003cp\u003eA piston head does two jobs at once. It has to seal against the cylinder wall for the whole stroke, and it has to let the spring rotate freely as it compresses. Most budget heads manage the first and fight the second, which costs you energy on every shot and twists the spring out of shape over time.\u003c\/p\u003e\u003cp\u003eThis one is CNC machined, double sealed, and carries a Japanese ball bearing on the spring face. Action Army describe the bearing as significantly improving how the spring works around its own axis, which is the technical way of saying it lets the spring wind and unwind instead of dragging.\u003c\/p\u003e\u003cp\u003eThey recommend it specifically for power tuning, and that is the honest place for it. On a stock rifle it is a refinement; on a heavily sprung build it is the difference between a spring that lasts and one that goes out of true.\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;\"\u003eFlat, double sealed AEG piston head\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eBearing\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eJapanese ball bearing on the spring face\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eManufacture\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eCNC machined\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eStated purpose\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eRecommended by the manufacturer for power tuned builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eDurability\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eDescribed by the manufacturer as extremely durable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eManufacturer code\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eA04-002\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eWeight and diameter\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eNot published by the manufacturer\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\u003e\u003cstrong\u003eFit it with a spring guide that also bears.\u003c\/strong\u003e A bearing at one end and a fixed face at the other only solves half the problem, and the spring will still fight you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCheck your piston first.\u003c\/strong\u003e A good head bolted to a cracked piston body buys you nothing, and the first tooth is where to look.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFlat heads suit most builds.\u003c\/strong\u003e There is no porting here, so if you are chasing a very specific cylinder volume you may want something else.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNo weight or diameter figure is published.\u003c\/strong\u003e Action Army give the construction and the intended use and nothing dimensional, so if your build is sensitive to piston head mass, ask us before ordering.\u003c\/p\u003e\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhy does the bearing matter?\u003c\/strong\u003e\u003cbr\u003eA main spring tries to rotate as it compresses. If the head will not let it, that energy is wasted and the spring slowly goes out of true.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this worth it on a stock rifle?\u003c\/strong\u003e\u003cbr\u003eIt will not hurt, but the manufacturer aims it at power tuned builds and that is where the difference shows.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it made from?\u003c\/strong\u003e\u003cbr\u003eIt is CNC machined and double sealed. Action Army do not publish the alloy specifically.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it come with the o-rings fitted?\u003c\/strong\u003e\u003cbr\u003eIt is supplied as a double sealed head, so the sealing is part of the part rather than an extra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need a bearing spring guide too?\u003c\/strong\u003e\u003cbr\u003eStrongly recommended. Bearings at both ends is what actually frees the spring up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it fit my piston?\u003c\/strong\u003e\u003cbr\u003eIt uses the standard AEG piston head fitment. If your piston is an unusual one, tell us which and we will check.\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\n⚠ \u003cstrong\u003eDo not overtighten it.\u003c\/strong\u003e A piston head screwed down hard enough to preload the bearing defeats the point of having one, and on a plastic piston body it is a good way to split the boss.\n\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 Change the head, the o-ring and the spring guide together. All three are fighting the same problem and doing one of them is half a fix. More in \u003ca href=\"\/collections\/spare-upgrade-parts\" style=\"color:#cdd6f4;\"\u003eour spare and upgrade parts section\u003c\/a\u003e.\n\u003c\/div\u003e","brand":"Action Army","offers":[{"title":"Default Title","offer_id":55739627929976,"sku":"68540935","price":23.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0562\/8097\/3450\/files\/ActionArmyAEGPistonHead_TitanForgeAirsoft.webp?v=1794667645","url":"https:\/\/www.titanforgeairsoft.com\/products\/action-army-double-o-ring-aeg-piston-head","provider":"Titan Forge Airsoft","version":"1.0","type":"link"}