MPN: ST5B503


  • Nickel Boron coating inside and out
  • Shot Peened, High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI)
  • Mil-Spec extractor spring, Viton O-ring


  • Caliber: 5.56 NATO / .223 Rem / 300 Blackout
  • Material: 158 Carpenter Steel
  • Finish: Nickel Boron
  • Weight: 1.52 oz.


  • AR-15


When you want a well-finished, exceptional quality nickel boron coated bolt for your AR-15 build you can’t do better than a Spike's Tactical AR-15 Nickel Boron Bolt. Spike’s has made it their mission to offer the best quality parts for your new builds and upgrade projects no matter who you are.

This bolt begins with the best quality 158 Carpenter Steel which is precision machined to meet Spike’s stringent standards. Its surface finish is polished, ultra-smooth and then it’s coated with ultra-slick nickel boron. Nickel boron is harder than phosphate and won’t crack and peel like chrome finishes, so you can rely on it for years to come. Nickel boron also features a self-lubricity that’s second to none. You’ll enjoy years of smooth cycling with little additional lubricant needed. You’re not just getting the ultra-smooth performance of ultra-hard nickel boron, but less lube means you’ll collect less dirt in your precision weapon system. Maintenance is easier and you have fewer concerns over potential malfunctions caused by dirt and grit in the field.

The Spike's Tactical AR-15 Nickel Boron Bolt is the same high-quality bolt they’ve offered in their M16 Bolt Carrier Group since 2010. You can count on this bolt, it’s got years of real world testing in addition to factory quality assurance. Like all of Spike’s bolts, the AR-15 Nickel Boron Bolt is High-Pressure Tested and Magnetic Particle Inspected. You can trust Spike’s tactical to deliver a quality product you can count on, every time. U.S. made quality, and Spike’s Tactical’s lifetime warranty help you get off the bench and get out in the world.

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