{ "@context": "https://schema.org/", "@type": "Product", "name": "MPI Nickel Boron AR-15 Bolt Carrier Group - M16 Cut", "description": "Nickel boron coated AR-15 Bolt Carrier Group with M16 cut. Features a Carpenter 158 steel bolt, 9310 steel carrier, 4140 steel extractor and ejector with nitride coating, magnetic particle inspection, and MIL-SPEC components throughout. 100% USA made.", "image": [ "https://cdn.shopify.com/s/files/1/0646/2282/1621/files/Nickel-AR15-BCG-M16-cut.png?v=1779121120" ], "url": "https://www.artakedowntool.com/products/mpi-nickel-boron-ar15-bcg-m16-cut", "sku": "MPI-NiB-BCG-M16-556", "brand": { "@type": "Brand", "name": "MPI" }, "offers": { "@type": "Offer", "priceCurrency": "USD", "price": "159.99", "availability": "https://schema.org/InStock", "url": "https://www.artakedowntool.com/products/mpi-nickel-boron-ar15-bcg-m16-cut", "seller": { "@type": "Organization", "name": "The Takedown Tools" } } } { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Is this BCG compatible with the Partisan Disruptor FRT?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. The MPI Nickel Boron BCG has an M16 cut, which is required for reliable operation with the Partisan Disruptor FRT. The M16 profile carrier tail provides the geometry the Disruptor&';s reset lobe needs to function correctly." } }, { "@type": "Question", "name": "What calibers does this BCG support?", "acceptedAnswer": { "@type": "Answer", "text": "This BCG is chambered for .223 Remington and 5.56 NATO and is compatible with all mil-spec AR-15 platforms in those calibers." } }, { "@type": "Question", "name": "What is the advantage of nickel boron over standard phosphate finish?", "acceptedAnswer": { "@type": "Answer", "text": "Nickel boron provides a harder, slicker surface than phosphate. It reduces friction between the bolt and carrier, runs cleaner with less fouling buildup, and is significantly easier to clean. It also offers excellent corrosion resistance." } }, { "@type": "Question", "name": "What is Carpenter 158 steel and why does it matter for the bolt?", "acceptedAnswer": { "@type": "Answer", "text": "Carpenter 158 is the MIL-SPEC steel specification for AR-15 bolts. It provides the correct balance of hardness, toughness, and fatigue resistance under the high-stress cycling of semi-automatic fire. It is the same standard used by military contractors." } }, { "@type": "Question", "name": "What does magnetic particle inspected (MPI) mean?", "acceptedAnswer": { "@type": "Answer", "text": "Magnetic particle inspection is a non-destructive testing process that detects surface and near-surface cracks in ferromagnetic materials. Every MPI-tested bolt is individually inspected to confirm there are no stress fractures or defects before it ships. It is the industry gold standard for bolt quality verification." } } ] } .nbcg { font-family: inherit; color: #111; line-height: 1.65; } .nbcg h2 { font-size: 18px; font-weight: 700; margin: 28px 0 10px; padding-top: 28px; border-top: 1px solid #e8e8e8; letter-spacing: .3px; } .nbcg h2:first-child { margin-top: 0; padding-top: 0; border-top: none; } .nbcg h3 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 1.5px; color: #cd7f2e; margin: 20px 0 8px; } .nbcg p { font-size: 14px; color: #444; margin-bottom: 12px; line-height: 1.65; } .nbcg ul { padding-left: 0; list-style: none; margin: 0 0 14px; } .nbcg ul li { font-size: 14px; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f0f0f0; position: relative; } .nbcg ul li::before { content: &';&';; color: #cd7f2e; position: absolute; left: 0; } .nbcg .spec-table { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: 14px; } .nbcg .spec-table th { background: #f8f8f8; font-weight: 600; text-align: left; padding: 8px 12px; border: 1px solid #e8e8e8; color: #111; width: 40%; font-size: 13px; } .nbcg .spec-table td { padding: 8px 12px; border: 1px solid #e8e8e8; color: #444; } .nbcg .spec-table tr:nth-child(even) td { background: #fafafa; } .nbcg .note { background: #fff8f0; border-left: 3px solid #cd7f2e; padding: 10px 14px; margin: 14px 0; font-size: 13px; color: #7a5520; border-radius: 0 3px 3px 0; line-height: 1.6; } .nbcg .frt-callout { background: #f0faef; border-left: 3px solid #1a7a1a; padding: 10px 14px; margin: 14px 0; font-size: 13px; color: #1a5a1a; border-radius: 0 3px 3px 0; line-height: 1.6; } Overview A fully MIL-SPEC Nickel Boron coated AR-15 Bolt Carrier Group built to run hard, clean easy, and last. M16 cut carrier, Carpenter 158 steel bolt, magnetic particle inspected - everything correct, nothing cut short. 100% USA made. FRT Compatible: M16 cut carrier is required for reliable function with the Partisan Disruptor FRT. This BCG meets that requirement. If you&';re building an FRT platform, see our Disruptor + HFRT Buffer Bundle - or add this BCG to complete the setup. Specifications Caliber .223 Remington / 5.56 NATO Finish Nickel Boron Carrier Cut M16 Cut Carrier Material 9310 Steel Bolt Material Carpenter 158 Steel Extractor & Ejector 4140 Steel - Nitride Coated Cam Pin 4140 Steel Firing Pin 8740 Steel - Hard Chrome Finish Gas Rings MIL-SPEC O-Ring MIL-SPEC Inspection Magnetic Particle Inspected (MPI) Origin 100% USA Made Price $159.99 Features Nickel boron finish - harder, slicker, and easier to clean than phosphate or standard nitride M16 cut carrier - required for FRT builds; compatible with all standard AR-15 platforms Carpenter 158 steel bolt - MIL-SPEC standard, same spec used by military contractors 9310 steel carrier - high-strength alloy with excellent fatigue resistance 4140 steel extractor & ejector with nitride coating - added hardness and corrosion resistance 4140 steel cam pin - matched hardness to carrier for long service life 8740 steel firing pin with hard chrome finish - corrosion resistant, dimensionally stable MIL-SPEC O-ring and gas rings - correct sealing and gas management from day one Magnetic particle inspected - every bolt individually tested for surface and subsurface defects 100% USA made Why Nickel Boron? Nickel boron is harder and has a lower coefficient of friction than phosphate. That means less heat buildup, less fouling adhesion, and a BCG that wipes clean in seconds rather than minutes. It runs reliably with or without lubrication - important for high-rate-of-fire applications like FRT builds where the BCG cycles under greater stress and frequency than standard semi-auto use. Combined with an M16 profile carrier and fully MIL-SPEC internals, this BCG is one of the most capable drop-in upgrades available for any mil-spec AR-15 platform. FRT Compatibility The Partisan Disruptor FRT requires an M16-profile BCG for reliable reset function. The M16 carrier tail provides the extended geometry that engages the Disruptor&';s reset lobe during the cycling stroke. A standard semi-auto carrier will not provide consistent reset. This BCG meets that requirement and is a direct recommended pairing for any Disruptor build. 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