{"product_id":"hk-army-mp5-regulator-piston-450-550psi","title":"HK Army MP5 Regulator Piston 450-550psi","description":"\u003ch2 style=\"font-size: 20px; margin-bottom: 10px;\"\u003eHK Army MP5 Regulator Piston 450-550psi\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3 style=\"font-size: 16px; margin-bottom: 5px;\"\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eMid Pressure Output:\u003c\/strong\u003e Preset to deliver a stable 450–550 PSI — ideal for markers and systems requiring mid-level operating pressure.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eBelleville Shim Stack:\u003c\/strong\u003e Disc spring technology delivers high force in a compact footprint — more consistent and space-efficient than traditional coil spring designs.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eQuick Swap Design:\u003c\/strong\u003e The entire shim stack pulls out in seconds — swap pressure settings without buying a new regulator.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eBrass Piston Construction:\u003c\/strong\u003e Durable brass body pre-fitted with all necessary O-rings for a leak-free seal right out of the box.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eRestore Worn Regulators:\u003c\/strong\u003e An affordable fix for Performance Series regulators that have lost consistent output pressure.\u003c\/div\u003e\n\u003chr class=\"divider\"\u003e\n\u003ch2 style=\"font-size: 20px; margin-bottom: 10px;\"\u003e\u003c!-- Full Description --\u003e\u003c\/h2\u003e\n\u003csection aria-label=\"Full product description\" class=\"desc-section\"\u003e\n\u003ch3 style=\"font-size: 16px; margin-bottom: 5px;\"\u003e\u003cstrong\u003ePrecision Pressure Control for Your HK Army Regulator\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eHK Army Performance Series MP5 Mid Pressure Piston\u003c\/strong\u003e is engineered for paintball players who need reliable, repeatable output pressure without the cost of a full regulator replacement. Whether you're tuning a new build or restoring a regulator that's no longer holding consistent pressure, this piston shim stack is the cleanest solution on the market.\u003c\/p\u003e\n\u003cp\u003eThe core of this upgrade is the \u003cstrong\u003eBelleville Shim Stack\u003c\/strong\u003e — a proven disc-spring system widely used in precision engineering for its ability to generate significant, consistent force within an extremely compact space. Compared to conventional coil-spring pistons, the Belleville design offers a more streamlined profile and more predictable spring force, translating directly into steadier output pressure shot after shot.\u003c\/p\u003e\n\u003cp\u003eInstallation is straightforward: simply remove the existing piston stack from your Performance Series regulator and drop in the MP5 unit. The shim stack wraps around a solid \u003cstrong\u003ebrass piston\u003c\/strong\u003e that arrives pre-fitted with all required O-rings — no hunting for extra hardware, no guesswork. The result is a leak-free fit and consistent mid-pressure output (450–550 PSI) from the very first shot.\u003c\/p\u003e\n\u003cp\u003eThis piston is one of the most cost-effective upgrades available for the HK Army Performance Series platform — far cheaper than purchasing a new regulator just to change your pressure setting.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003ch2 style=\"font-size: 20px; margin-bottom: 10px;\"\u003e\u003c!-- Specs --\u003e\u003c\/h2\u003e\n\u003csection aria-label=\"Product specifications\" class=\"specs-section\"\u003e\n\u003ch3 style=\"font-size: 16px; margin-bottom: 5px;\"\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cdiv class=\"spec-item\"\u003eOutput Pressure Range: 450–550 PSI (Mid Pressure)\u003c\/div\u003e\n\u003cdiv class=\"spec-item\"\u003eSpring Type: Belleville Shim Stack (Disc Springs)\u003c\/div\u003e\n\u003cdiv class=\"spec-item\"\u003ePiston Material: Brass\u003c\/div\u003e\n\u003cdiv class=\"spec-item\"\u003eO-Rings Included: Yes — pre-installed\u003c\/div\u003e\n\u003cdiv class=\"spec-item\"\u003eInstallation: Drop-in (no tools required)\u003c\/div\u003e\n\u003cdiv class=\"spec-item\"\u003eCompatible Regulators: HK Army Performance Series (HP8, MP5, LP3)\u003c\/div\u003e\n\u003c\/section\u003e\n\u003ch2 style=\"font-size: 20px; margin-bottom: 10px;\"\u003e\u003c!-- FAQ --\u003e\u003c\/h2\u003e\n\u003csection aria-label=\"Frequently asked questions\" class=\"faq-section\"\u003e\n\u003ch2 style=\"font-size: 20px; margin-bottom: 10px;\"\u003e\u003c!-- Caution --\u003e\u003c\/h2\u003e\n\u003cdiv aria-label=\"Safety caution\" role=\"note\" class=\"caution-box\"\u003e\n\u003cstrong\u003e⚠ Safety Notice:\u003c\/strong\u003e Always ensure your HPA air system is \u003cstrong\u003ecompletely degassed\u003c\/strong\u003e before removing or installing any piston or regulator component. Failure to do so may result in personal injury or equipment damage.\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\u003c\/section\u003e","brand":"HK Army","offers":[{"title":"Default Title","offer_id":41733861245061,"sku":"110-410-00152","price":14.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0042\/7347\/1606\/files\/110-410-00152.jpg?v=1782492977","url":"https:\/\/www.discountpaintball.com\/products\/hk-army-mp5-regulator-piston-450-550psi","provider":"Discount Paintball","version":"1.0","type":"link"}