{"product_id":"cmmg-ar15-buffer-tube-castle-nut","title":"CMMG AR15 Buffer Tube Castle Nut – AR-15 Platform","description":"\u003cp\u003eThe CMMG AR15 Buffer Tube Castle Nut is a replacement or spare castle nut designed to secure the buffer tube to the lower receiver on AR-15 pattern rifles. This component threads onto the receiver extension and locks it in place, preventing rotation under recoil and ensuring the end plate stays properly positioned. Whether you're replacing a damaged nut, completing a build, or keeping a spare on hand, this castle nut provides reliable function at the rear of your receiver.\u003c\/p\u003e\u003cp\u003eMachined from steel with a durable finish, this castle nut features standard AR-15 threading and staking slots for proper installation. Installation requires an armorer's wrench and should be staked in place to prevent loosening during use. A castle nut staking tool is recommended for best results.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Castle Nut\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 or Black Oxide (manufacturer standard)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Armorer's Wrench Required, Staking Recommended\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e (1) Castle Nut\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":47934698782975,"sku":"CMMG55CA9CB","price":8.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/1256810.jpg?v=1766476751","url":"https:\/\/doublestackstore.com\/products\/cmmg-ar15-buffer-tube-castle-nut","provider":"Double Stack Store","version":"1.0","type":"link"}