*CONTACT US FOR A SPECIAL COUPON CODE!*
Spike's Tactical® Nickel Boron M16 Bolt Carrier Group – 5.56mm NATO / .223 Rem – NiB Coating – ST5BG03
The Spike's Tactical® Nickel Boron M16 Bolt Carrier Group (ST5BG03) is a premium, duty-grade core cycling component precision-engineered to provide extreme lubricity and operational longevity within AR-15 and M16 rifle systems. While standard phosphate bolt carrier groups rely on a rough, porous finish that easily traps carbon fouling and demands heavy wet lubrication to prevent friction-induced cycling failures, this advanced assembly completely bypasses those performance hurdles. This full-auto mass premium tracking hub (855319005501) utilizes a high-tech aerospace coating to deliver an ultra-slick tracking engine that keeps cycling reliably through high-volume training days, harsh field environments, and suppressor-ready tactical deployments.
The foundation of this hard-use cycling group begins with a full-mass, **M16-profile full-auto carrier** meticulously machined from premium **8620 tool steel**. Following precise heat treatment and surface hard-turning, the entire carrier chassis—along with the bolt, gas key, and extractor—is completely plated in an elite **Nickel Boron (NiB) finish**. This high-performance, mirror-smooth chemical armor achieves a rock-hard surface rating of over 70 Rockwell C, delivering a coefficient of friction so incredibly low that the component can confidently run dry or with minimal lubrication in emergencies. Baked-on carbon simply cannot weld to the non-porous nickel boron boundary matrix, transforming clean-up into a rapid, painless process that requires nothing more than a quick wipe down with a microfiber rag.
The bolt assembly itself is precision-ground from premium, military-spec **Carpenter 158 steel**, shot-peened to densify the molecular surface layer, and stringently **High-Pressure Tested (HPT)** and **Magnetic Particle Inspected (MPI)** to eliminate the risk of hidden subsurface micro-fissures. To handle intense gas pressure shifts, the gas key is precision-mated using high-tensile Grade 8 fasteners and deeply **staked to military specifications**, guaranteeing a permanent, leak-proof seal that will not vibrate loose. Backed by Spike's Tactical legendary lifetime warranty, this American-made workhorse delivers unyielding mechanical predictability when failure is not an option.
Includes: (1) Spike's Tactical M16-Profile Bolt Carrier Group (Nickel Boron Finish), (1) Carpenter 158 MPI/HPT Bolt Assembly, Pre-Installed Mil-Spec Extractor Spring & Crane O-Ring, Properly Staked Gas Key, Hardened Cam Pin, and Firing Pin.
*Technical Coating Maintenance Tip: Over time and high volumes of fire, it is completely normal for a Nickel Boron finish to naturally darken or show discoloration from intense powder gasses and copper solvents. This visual shift is purely cosmetic and does not affect the ultra-low friction properties or structural performance of the underlying NiB armor matrix.
Key Features
- Elite Nickel Boron (NiB) Plating: High-tech aerospace plating delivers an ultra-smooth, slick surface layer that drastically drops mechanical friction while providing excellent wear and corrosion defense.
- Full-Mass M16 Combat Profile: Retains standard full-auto military carrier mass to extend internal dwell times, smoothing out extraction cycles and noticeably softening perceived recoil.
- Shot-Peened Carpenter 158 Steel Bolt: Premium mil-spec structural steel bolt head is bombard-tempered and verified via HPT/MPI tracking to ensure flaw-free performance under intense duty cycles.
- Effortless Carbon Clean-up: The non-porous nickel boron boundary layer completely stops baked-on powder residue from welding to the metal tail, allowing it to easily wipe clean with a shop rag.
- True Mil-Spec Staked Gas Key: Heavy-duty gas key assembly is torqued over Grade 8 hardened fasteners and permanently locked down using strict physical metal displacement staking.
- Upgraded Extractor Hardware: Pre-outfitted with a premium heavy-duty extractor spring assembly and integrated Viton O-ring to ensure powerful, positive case ejection even when running dirty.
Product Specifications
- Brand: Spike's Tactical® (Apopka, FL)
- Product Line: Premium Core Component Series
- Model Name: M16 Bolt Carrier Group Nickel Boron
- SKU / MPN: ST5BG03
- Firearm Platform System: Standard AR-15, M4, M16 Pattern Upper Receivers
- Cartridge Caliber Accommodation: 5.56x45mm NATO / .223 Remington / 300 AAC Blackout
- Carrier Profile Style: M16 Full Auto Profile (Increased Mass & Dwell Time)
- Carrier Core Material: 8620 Premium Case-Hardened Tool Steel
- Bolt Steel Chemistry: Genuine Carpenter 158 Carbon Steel Alloy
- Surface Treatment Finish: Premium Nickel Boron (NiB) Electroplating
- Quality Assurance Matrix: Shot-Peened Core / Magnetic Particle Inspected (MPI) / High Pressure Tested (HPT)
- Gas Fastener Assembly: Mil-Spec Staked Grade 8 Hardened Fasteners
- Gas Ring Array Spec: Standard Triple Helix Stainless Steel Ring Matrix
- Country of Origin: Proudly Made in the USA
- Product Net Assembly Weight: ~11.60 oz (328.8 g)
- UPC: 855319005501
