{"product_id":"shs-piston-19-tooth-long-gearbox-sr25-r85","title":"SHS Piston — 19 Teeth, Long Gearbox for SR25 and R85","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;\"\u003eSHS 19 Tooth Piston for Long Gearboxes — the longer rack, for SR25 and R85 pattern shells.\u003c\/strong\u003e Not a Version 2 part.\n\u003c\/div\u003e\n\u003cp\u003eLong gearboxes run a longer stroke, and the piston has to carry more teeth to match it. This one carries nineteen.\u003c\/p\u003e\n\u003cp\u003ePut a standard rack into a long shell and the sector gear picks it up at the wrong point. You lose stroke, the timing goes out, and the engagement lands across fewer teeth than it should.\u003c\/p\u003e\n\u003cp\u003ePlatforms using this length include the SR25 pattern and the R85. If you are not certain which shell is in front of you, count the teeth on the piston you removed 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;\"\u003ePiston\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eTeeth\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003e19\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eRack\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eBody\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eReinforced polymer\u003c\/td\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;\"\u003eLong gearbox shells, SR25 and R85 pattern\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eSold as\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eSingle piston\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\n\u003cp\u003eThis is a platform part rather than an upgrade. It suits shells built for the longer stroke and it will not go into a Version 2 or Version 3.\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\u003eWill it fit a Version 2 gearbox?\u003c\/strong\u003e \u003cbr\u003eNo. The rack is longer than a Version 2 shell allows. Those take a fourteen or fifteen tooth piston instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I confirm my gearbox takes this?\u003c\/strong\u003e \u003cbr\u003eCount the teeth on the old piston. Nineteen puts you in the right place.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it come with a piston head?\u003c\/strong\u003e \u003cbr\u003eNo, the piston is supplied on its own.\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\n⚠ \u003cstrong\u003eCount the teeth before you order:\u003c\/strong\u003e long gearbox pistons and standard ones are not interchangeable in either direction, and the shell will not close on the wrong length.\n\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 Keep the old piston once it is out. It is the quickest reference you have for tooth count and head thread the next time round. Browse \u003ca href=\"\/collections\/piston-cylinder-heads\" style=\"color:#cdd6f4;\"\u003epistons and piston heads\u003c\/a\u003e.\n\u003c\/div\u003e","brand":"SHS","offers":[{"title":"Default Title","offer_id":55677710565752,"sku":"53816478","price":10.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0562\/8097\/3450\/files\/SHS19ToothPistonforSR25andR85_TitanForgeAirsoft.webp?v=1790346609","url":"https:\/\/www.titanforgeairsoft.com\/products\/shs-piston-19-tooth-long-gearbox-sr25-r85","provider":"Titan Forge Airsoft","version":"1.0","type":"link"}