MPN: 0011570003


  • Magnetic Particle Inspected (MPI)
  • Mil-Spec M16 dimensions
  • Full-Auto rated
  • Mil-Spec Staked Gas Key
  • Grade 8 Hardened Fasteners


  • Caliber: 5.56 NATO / .223 Rem. / 300BLK
  • Weight: 11.32 oz.
  • Finish: Melonite
  • Material:
    • Carrier: 8620 Steel
    • Bolt: 9130 Steel
    • Extractor: 4140 Steel
    • Gas Key: 4130 Steel
  • Profile: Full-Auto

**A full-auto (A.K.A. M16) bolt carrier installed in a standard semi-auto AR-15 will not make the gun fire full-auto.


  • AR-15


  • 1x 5.56 NATO / .223 Rem. / 300 Blackout Bolt
  • 1x Carrier
  • 1x Extractor
  • 1x Cam Pin
  • 1x Carrier Key
  • 1x Firing Pin


When you get ready to upgrade your AR-15 to the 21st century you have to look for the latest and greatest parts there are. If you’re still running last centuries bolt carrier group that’s a perfect place to start. You need a BCG that will run smoothly and reliably. You’re looking for a Seekins Precision NX15 Bolt Carrier Group.

Bolt Carrier Group Perfection

Undoubtedly, the new Seekins NX15 BCG brings the best to your AR-15 with this drop-in upgrade. Because of their superior design and engineering, the melonite bolt carrier group gives you a smooth and reliable cycle in your AR-15. The melonite finish is a Quench Polish Quench (QPQ) treatment resulting in a super-hard, durable surface that is fast becoming the industry standard. Each Seekins Precision NX15 Bolt Carrier Group must pass magnetic particle inspection (MPI) before it is allowed to leave the Seekins factory in Idaho. MPI is a state-of-the-art test which applies a magnetic field to the surface of your new Seekins NX15 BCG. This procedure detects any imperfection in the bolts surface, even one that is undetectable to the naked eye. There’s no way to fool this test when your melonite bolt carrier group passes you know it’s perfect.

Your AR Will Feel Better

You don’t have to worry whether or not the Seekins NX15 BCG will work in your AR-15 because it is designed to Mil-Spec dimensions. You will minimize misfeeds with the melonite bolt carrier group feeding round after round for you through your weapon. Whether you want one for work or for play, one will definitely work for you today.

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