{"product_id":"polished-chrome-bcg","title":"Highly Polished Mirror Chrome BCG — Full Auto Bolt Carrier Group | 5.56 \/ .223 \/ 300 BLK","description":"\u003c!-- ============ BLOCK 1: SEO FIELDS ============ --\u003e\n\u003c!-- SEO TITLE (59 chars): Polished Chrome BCG — Full Auto M16 5.56 Bolt Carrier Group --\u003e\n\u003c!-- META DESCRIPTION (151 chars): Mirror-polished chrome BCG for AR-15 and M16. Full auto profile, C158 bolt, 8620 carrier, MPI and HPT tested. 5.56, .223 and 300 Blackout. Made in USA. --\u003e\n\n\u003c!-- ============ BLOCK 2: SCHEMA (JSON-LD) ============ --\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Highly Polished Mirror Chrome BCG — Full Auto Bolt Carrier Group\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"Trigger Supply\"\n  },\n  \"description\": \"A mirror-finish polished chrome bolt carrier group built to true mil-spec dimensions for AR-15, M4 and M16 platforms. Full auto profile carrier in 8620 tool steel with a C158 bolt, properly staked 4130 gas key, and 4140 extractor and cam pin. Magnetic particle inspected and high pressure tested. Chambered for 5.56x45mm NATO, .223 Remington and .300 AAC Blackout.\",\n  \"sku\": \"CHROME-BCG-POLISHED\",\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"price\": \"249.99\",\n    \"priceCurrency\": \"USD\",\n    \"availability\": \"https:\/\/schema.org\/InStock\"\n  }\n}\n\u003c\/script\u003e\n\n\u003c!-- ============ BLOCK 3: DESCRIPTION HTML ============ --\u003e\n\u003cdiv id=\"pw\"\u003e\n\u003cstyle\u003e\n#pw .cbc-wrap{width:100%!important;max-width:100%!important;color:#1a1a1a!important;font-family:'DM Sans',Helvetica,Arial,sans-serif!important;line-height:1.65!important}\n#pw .cbc-h2{font-family:'Bebas Neue',Impact,sans-serif!important;font-size:28px!important;letter-spacing:1px!important;color:#0a0a0a!important;margin:28px 0 10px 0!important;border-bottom:2px solid #c8913a!important;padding-bottom:6px!important}\n#pw .cbc-h3{font-family:'Bebas Neue',Impact,sans-serif!important;font-size:21px!important;letter-spacing:.5px!important;color:#0a0a0a!important;margin:20px 0 6px 0!important}\n#pw .cbc-p{font-size:16px!important;color:#1a1a1a!important;margin:0 0 14px 0!important}\n#pw .cbc-flag{background:#fff8ec!important;border-left:4px solid #c8913a!important;padding:14px 16px!important;margin:18px 0!important;font-size:15px!important;color:#1a1a1a!important}\n#pw .cbc-list{margin:0 0 16px 20px!important;padding:0!important}\n#pw .cbc-list li{font-size:16px!important;color:#1a1a1a!important;margin-bottom:8px!important}\n#pw .cbc-table{width:100%!important;border-collapse:collapse!important;margin:14px 0 20px 0!important;font-size:15px!important}\n#pw .cbc-table th{background:#0a0a0a!important;color:#ffffff!important;text-align:left!important;padding:10px 12px!important;font-family:'Bebas Neue',Impact,sans-serif!important;letter-spacing:.5px!important;font-size:16px!important}\n#pw .cbc-table td{border-bottom:1px solid #e0e0e0!important;padding:10px 12px!important;color:#1a1a1a!important}\n#pw .cbc-table td:first-child{font-weight:700!important;color:#0a0a0a!important;width:38%!important}\n#pw .cbc-links{background:#0a0a0a!important;padding:18px 20px!important;margin:26px 0 0 0!important}\n#pw .cbc-links p{color:#ffffff!important;font-size:15px!important;margin:0 0 10px 0!important}\n#pw .cbc-links a{color:#c8913a!important;text-decoration:underline!important;font-weight:700!important}\n#pw .cbc-legal{font-size:14px!important;color:#555555!important;border-top:1px solid #e0e0e0!important;padding-top:14px!important;margin-top:22px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"cbc-wrap\"\u003e\n\n\u003cp class=\"cbc-p\"\u003e\u003cstrong\u003eMost BCGs are built to disappear inside the receiver. This one wasn't.\u003c\/strong\u003e A true mil-spec bolt carrier group finished in highly polished mirror chrome — the kind of finish that turns a glass-top build into a centerpiece and makes an ejection port worth looking into. But the finish is the last thing that matters here, not the first.\u003c\/p\u003e\n\n\u003cp class=\"cbc-p\"\u003eUnderneath the mirror is a full auto profile carrier machined from 8620 tool steel, a C158 bolt, a properly staked 4130 gas key, and a 4140 extractor and cam pin. Every unit is magnetic particle inspected and high pressure tested. Built to true mil-spec dimensions, made in the USA, and rated for full auto duty cycles whether or not your rifle will ever see them.\u003c\/p\u003e\n\n\u003ch2 class=\"cbc-h2\"\u003eWhy Chrome Actually Matters\u003c\/h2\u003e\n\u003cp class=\"cbc-p\"\u003ePolished chrome isn't only cosmetic. The hard, slick surface reduces friction against the receiver walls, resists carbon adhesion, and wipes clean with far less effort than phosphate. Carbon that would normally bake onto a parkerized carrier tends to lift off chrome with a rag and solvent — which matters a great deal if you run suppressed, run a forced reset trigger, or run high round counts between cleanings.\u003c\/p\u003e\n\n\u003cul class=\"cbc-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlicker cycling.\u003c\/strong\u003e Lower friction against receiver walls than phosphate or nitride.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasier cleanup.\u003c\/strong\u003e Carbon fouling releases instead of bonding to the surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion resistant.\u003c\/strong\u003e Chrome holds up against sweat, humidity and long safe storage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShow-build ready.\u003c\/strong\u003e A mirror finish that reads as intentional through a clear or skeletonized upper.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 class=\"cbc-h2\"\u003eSpecifications\u003c\/h2\u003e\n\u003ctable class=\"cbc-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eHighly polished mirror chrome\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eAR-15 \/ M4 \/ M16 — full auto rated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCalibers\u003c\/td\u003e\n\u003ctd\u003e5.56x45mm NATO, .223 Remington, .300 AAC Blackout\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCarrier profile\u003c\/td\u003e\n\u003ctd\u003eFull auto style with properly staked gas key\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCarrier material\u003c\/td\u003e\n\u003ctd\u003e8620 tool steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBolt material\u003c\/td\u003e\n\u003ctd\u003eC158\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGas key\u003c\/td\u003e\n\u003ctd\u003e4130 steel, properly staked\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtractor \u0026amp; cam pin\u003c\/td\u003e\n\u003ctd\u003e4140 steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal weight\u003c\/td\u003e\n\u003ctd\u003e10.5 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eTrue mil-spec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTesting\u003c\/td\u003e\n\u003ctd\u003eMagnetic particle inspected (MPI) and high pressure tested (HPT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eMade in the USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2 class=\"cbc-h2\"\u003eMPI and HPT — What They Actually Mean\u003c\/h2\u003e\n\u003cp class=\"cbc-p\"\u003eThese two acronyms get printed on a lot of listings and explained on almost none of them. \u003cstrong\u003eHigh pressure testing\u003c\/strong\u003e means each bolt is fired with an overpressure proof round well beyond normal chamber pressure to confirm it survives worst-case conditions. \u003cstrong\u003eMagnetic particle inspection\u003c\/strong\u003e then checks that same bolt for microscopic cracks invisible to the eye. A bolt that passes both has been proven, not assumed. Skipping these is where cheap BCGs save money — and where they fail, usually at the bolt lugs.\u003c\/p\u003e\n\n\u003ch2 class=\"cbc-h2\"\u003eFitment\u003c\/h2\u003e\n\u003ch3 class=\"cbc-h3\"\u003eFits\u003c\/h3\u003e\n\u003cul class=\"cbc-list\"\u003e\n\u003cli\u003eStandard AR-15, M4 and M16 pattern uppers in 5.56 NATO and .223 Remington\u003c\/li\u003e\n\u003cli\u003e.300 AAC Blackout uppers using a standard 5.56 bolt face\u003c\/li\u003e\n\u003cli\u003eMil-spec and forged receivers built to standard dimensions\u003c\/li\u003e\n\u003cli\u003eSemi-auto and full auto profile lowers — the full auto carrier profile is legal in a semi-auto rifle and adds carrier mass for smoother cycling\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 class=\"cbc-h3\"\u003eDoes not fit\u003c\/h3\u003e\n\u003cul class=\"cbc-list\"\u003e\n\u003cli\u003eAR-10 \/ .308 platforms — this is an AR-15 pattern BCG\u003c\/li\u003e\n\u003cli\u003e9mm blowback uppers, which require a dedicated 9mm bolt carrier\u003c\/li\u003e\n\u003cli\u003eNon-standard or proprietary receiver dimensions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"cbc-flag\"\u003e\n\u003cstrong\u003eRunning a forced reset trigger?\u003c\/strong\u003e Carrier quality and gas key staking matter more with an FRT than with a standard trigger, because the reset relies on consistent, repeatable carrier travel. A properly staked full auto profile carrier is the right foundation for an FRT build.\n\u003c\/div\u003e\n\n\u003cdiv class=\"cbc-links\"\u003e\n\u003cp\u003e\u003cstrong\u003eBuild it out:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/best-frt-triggers-for-ar-15\"\u003eBest FRT triggers for AR-15 — full buyer's guide\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/blogs\/blogs\/how-forced-reset-triggers-work\"\u003eHow forced reset triggers actually work\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/partisan-triggers-collection\"\u003eShop The Triggered Company Disruptor FRT\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/are-frt-triggers-legal\"\u003eAre FRT triggers legal? State-by-state resource\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp class=\"cbc-legal\"\u003ePolished chrome is a functional finish with a cosmetic benefit. Normal handling, installation and use will produce light surface marks over time; this is expected wear and not a defect. Verify your build's gas system and buffer weight are correctly matched before use.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n","brand":"Trigger Supply","offers":[{"title":"Default Title","offer_id":48453696880885,"sku":null,"price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0646\/2282\/1621\/files\/High_Polish_Chrome_5.56_AR-15_Bolt_Carrier_Group_BCG_FRT.png?v=1784604070","url":"https:\/\/www.artakedowntool.com\/products\/polished-chrome-bcg","provider":"The Takedown Tools","version":"1.0","type":"link"}