{"product_id":"hpa-adapter-m870-breacher-shotgun-to-m4","title":"HPA Adapter M870 Breacher Shotgun to M4","description":"\u003cp\u003eA plug and play HPA adapter that converts compatible M870-style gas shotguns to use an external HPA system with Airsoft M4 AEG magazines.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible with TM M870, Breacher, Golden Eagle and Secutor style gas shotguns.\u003c\/li\u003e\n\u003cli\u003eCompatible with most Airsoft M4 AEG magazines.\u003c\/li\u003e\n\u003cli\u003ePlug and play design with valve, feed lips and gas router pre-installed.\u003c\/li\u003e\n\u003cli\u003eNo donor parts or assembly required.\u003c\/li\u003e\n\u003cli\u003eInjection moulded polycarbonate M4 magazine well.\u003c\/li\u003e\n\u003cli\u003ePolished internal magazine well for smoother magazine insertion.\u003c\/li\u003e\n\u003cli\u003eAdjustable side shims reduce magazine wobble.\u003c\/li\u003e\n\u003cli\u003eReversible side shims provide additional adjustment for wider magwells.\u003c\/li\u003e\n\u003cli\u003eRear adjustment screw reduces vertical movement of the adapter.\u003c\/li\u003e\n\u003cli\u003eIntegrated BB retention system minimises BB loss during magazine changes.\u003c\/li\u003e\n\u003cli\u003eSwappable rear magazine shim included.\u003c\/li\u003e\n\u003cli\u003eRecommended operating pressure: up to 150 PSI maximum.\u003c\/li\u003e\n\u003cli\u003eSupplied with a US Foster HPA fitting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe AIRTAC M870 Breacher Shotgun to M4 HPA Adapter converts compatible M870-style gas shotguns to operate from an external High Pressure Air system while feeding from Airsoft M4 AEG magazines. Designed for TM M870, Breacher, Golden Eagle and Secutor style platforms, it provides increased ammunition capacity and faster reloads without requiring permanent modification to the shotgun.\u003cbr\u003e\u003cbr\u003eSupplied fully assembled, the adapter includes the valve, feed lips and gas router already installed, allowing it to be fitted straight from the box without transferring components from an existing gas reservoir. The injection moulded polycarbonate magwell features polished internal surfaces to promote smooth magazine insertion and reliable operation.\u003cbr\u003e\u003cbr\u003eTo improve fitment across different shotgun manufacturing tolerances, the adapter incorporates adjustable side shims and a rear adjustment screw. The side shims can also be reversed to provide additional adjustment for wider magwells, while the rear screw reduces vertical movement within the receiver. An integrated BB retention system helps minimise BB loss during magazine changes for more efficient reloading during gameplay.\u003cbr\u003e\u003cbr\u003eDesigned for compatibility with most Airsoft M4 AEG magazines, the adapter is supplied with a US Foster HPA fitting and should only be operated with a regulated HPA system at a maximum pressure of 150 PSI.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eRange Overview:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eAirTac’s HPA Adapters range converts traditional gas-powered replicas to use high-pressure air magazine systems with seamless reliability. Designed for multiple replica platforms, each adapter features precision-moulded construction, a secure BB-retention system, and standardised US-thread fittings for broad compatibility. The range combines rugged strength with practical installation, giving players smoother reloads and extended playtime through improved air efficiency and modular flexibility.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInjection-moulded polymer housings provide durability and consistent alignment\u003c\/li\u003e\n\u003cli\u003eStandard US-thread fittings ensure cross-system HPA compatibility\u003c\/li\u003e\n\u003cli\u003eIntegrated BB-retention systems prevent feed loss during reloads\u003c\/li\u003e\n\u003cli\u003eSupplied with magwell inserts, screws and shim sets for precise fitment\u003c\/li\u003e\n\u003cli\u003eAvailable for multiple pistol and SMG platforms for modular loadouts\u003c\/li\u003e\n\u003cli\u003eEngineered for reliability, consistency and long-term performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eBrand Statement:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eAirTac specialise in developing high-performance HPA conversion systems for airsoft enthusiasts seeking consistent, efficient, and adaptable performance. Their focus on precision engineering and robust construction ensures every product delivers dependable field use, intuitive function, and lasting value.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSafety Information:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eDo not exceed 150 PSI when operating any airsoft HPA adapter Always use air regulated by a secondary regulator Check PSI output before connecting air to the adapter Do not connect directly to unregulated air sources, CO2 systems, or high-pressure tanks Do not use with incompatible high-pressure air lines or fittings Always ensure correct setup and operation before use\u003c\/p\u003e","brand":"Airtac","offers":[{"title":"Default Title","offer_id":56943368700290,"sku":"AT-M870-M4","price":35.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/8224\/7217\/files\/HPAAdapterM870BreacherShotguntoM4.jpg?v=1790266854","url":"https:\/\/killerinstinctairsoft.co.uk\/products\/hpa-adapter-m870-breacher-shotgun-to-m4","provider":"Killer Instinct Tactical","version":"1.0","type":"link"}