{"product_id":"cmmg-rifle-receiver-ext-stock-kit","title":"CMMG 55CA646 Rifle Receiver Extension\/Stock Kit – AR-15 Platform","description":"\u003cp\u003eThe CMMG Rifle Receiver Extension\/Stock Kit provides a complete solution for building or upgrading AR-15 rifles with a fixed stock configuration. This kit delivers a stable shooting platform that eliminates movement and enhances consistency, making it ideal for precision shooting applications where a solid cheek weld and repeatable positioning matter most.\u003c\/p\u003e\u003cp\u003eThis complete kit includes a rifle-length receiver extension (buffer tube), castle nut, and end plate—everything needed for installation of a rifle-length fixed stock. The receiver extension is manufactured to mil-spec dimensions ensuring compatibility with standard AR-15 lower receivers and rifle stocks. Constructed from durable steel with a phosphate finish for corrosion resistance. Installation requires standard armorer's tools and is straightforward for builders familiar with AR-platform assembly.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Rifle Receiver Extension Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Firearms:\u003c\/strong\u003e AR-15 platform rifles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Phosphate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable:\u003c\/strong\u003e No (fixed rifle-length configuration)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Requires armorer's wrench and basic tools\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Includes:\u003c\/strong\u003e Receiver extension, castle nut, end plate\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":47934697701631,"sku":"CMMG55CA646","price":97.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/1256478.jpg?v=1766476618","url":"https:\/\/doublestackstore.com\/products\/cmmg-rifle-receiver-ext-stock-kit","provider":"Double Stack Store","version":"1.0","type":"link"}