{"product_id":"full-auto-bolt-carrier-group-556-223-300-blk","title":"Full Auto Bolt Carrier Group | 5.56 \/ .223 \/ 300 BLK","description":"\u003cp\u003e\u003cstrong\u003eMost BCGs are built to disappear inside the receiver. This one wasn't.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA 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\u003cp\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\u003ch2\u003eWhy Chrome Actually Matters\u003c\/h2\u003e\u003cp\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\u003cul\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\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\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\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eMPI and HPT — What They Actually Mean\u003c\/h2\u003e\u003cp\u003eThese two acronyms get printed on a lot of listings and explained on almost none of them. High pressure testing means each bolt is fired with an overpressure proof round well beyond normal chamber pressure to confirm it survives worst-case conditions. Magnetic particle inspection 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\u003ch2\u003eFitment\u003c\/h2\u003e\u003cul\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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes not fit:\u003c\/strong\u003e AR-10 \/ .308 platforms, 9mm blowback uppers, or non-standard receiver dimensions\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eRunning a forced reset trigger? Carrier quality and gas key staking matter more with an FRT. A properly staked full auto profile carrier is the right foundation for an FRT build.\u003c\/em\u003e\u003c\/p\u003e\u003cp\u003e\u003csmall\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\/small\u003e\u003c\/p\u003e","brand":"The Takedown Tools","offers":[{"title":"Default Title","offer_id":48930537209921,"sku":"wch1789892597861","price":199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/4236\/2433\/files\/full-auto-bolt-carrier-group-556-223-300-blk_1.png?v=1789892601","url":"https:\/\/overdoorhangfit.shop\/products\/full-auto-bolt-carrier-group-556-223-300-blk","provider":"My Store","version":"1.0","type":"link"}