{"product_id":"maxim-9mm-roller-delayed-systm-cqb","title":"Maxim Defense Industries 9mm Roller Delayed System CQB – AR-15 Upper Conversion","description":"\u003cp\u003eThe Maxim Defense Industries 9mm Roller Delayed System CQB converts AR-15 lower receivers to 9mm operation using a roller-delayed blowback system. This upper assembly reduces felt recoil and cyclic rate compared to direct blowback 9mm AR systems while maintaining compatibility with standard AR-15 fire control groups. The CQB configuration offers a compact barrel length optimized for close-quarters applications and home defense.\u003c\/p\u003e\u003cp\u003eThe roller-delayed mechanism uses a two-piece bolt with steel rollers that delay rearward travel, resulting in softer impulse and reduced carrier velocity. The upper is machined from 7075-T6 aluminum with a Type III hard anodized finish. Installation requires no permanent modifications to your AR-15 lower—simply remove the existing upper and attach this complete assembly. Professional installation recommended for shooters unfamiliar with AR-15 platform assembly. System requires 9mm magazines compatible with Glock pattern or Colt pattern (verify included magazine well adapter).\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Complete Upper Receiver Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Firearms:\u003c\/strong\u003e AR-15 Lower Receivers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e 9mm Luger\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating System:\u003c\/strong\u003e Roller-Delayed Blowback\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 7075-T6 Aluminum (Upper), Steel (Bolt Components)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Type III Hard Anodized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Drop-In (No Gunsmithing Required)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Complete Upper Assembly, Charging Handle, Bolt Carrier Group\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Maxim Defense Industries","offers":[{"title":"Default Title","offer_id":48301565706495,"sku":"MXM-47838","price":181.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/5803520.jpg?v=1773888579","url":"https:\/\/doublestackstore.com\/products\/maxim-9mm-roller-delayed-systm-cqb","provider":"Double Stack Store","version":"1.0","type":"link"}