{"product_id":"yhm-dust-cover-assy-300-blk","title":"Yankee Hill Machine Co YHM Dust Cover Assembly 300 BLK – AR-15 Ejection Port Cover","description":"\u003cp\u003eThe Yankee Hill Machine Co YHM-111-300 dust cover assembly is a replacement ejection port cover marked for 300 Blackout chamberings. This assembly prevents dirt, debris, and moisture from entering the upper receiver through the ejection port when the rifle is not in use or being transported. The 300 BLK roll mark provides a clear visual indicator of the chambering, which is a practical safety feature when maintaining multiple AR-platform rifles in different calibers.\u003c\/p\u003e\u003cp\u003eConstructed from mil-spec materials with a black finish, this dust cover is a direct drop-in replacement for AR-15 and AR-10 pattern rifles chambered in 300 Blackout. Installation requires basic tools and familiarity with AR-15 assembly procedures—the spring-loaded rod simply pins into the upper receiver. The assembly includes the cover, spring, and C-clip for complete installation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Ejection Port Dust Cover Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Firearms:\u003c\/strong\u003e AR-15\/AR-10 pattern rifles chambered in 300 Blackout\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Mil-spec steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarking:\u003c\/strong\u003e 300 BLK roll mark\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Drop-in with basic tools\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Dust cover, spring, C-clip\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yankee Hill Machine Co","offers":[{"title":"Default Title","offer_id":47940886167807,"sku":"YHM-111-300","price":15.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/1314111.jpg?v=1766568752","url":"https:\/\/doublestackstore.com\/products\/yhm-dust-cover-assy-300-blk","provider":"Double Stack Store","version":"1.0","type":"link"}