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Bolt Carrier Group - Toolcraft M16 Nickel Boron EXO Technology - Custom AR-15 Sales Bolt Carrier Group - Toolcraft M16 Nickel Boron EXO Technology - Custom AR-15 Sales

Bolt Carrier Group – Toolcraft M16 Nickel Boron EXO Technology

(4 customer reviews)


We ship same day or next…ALWAYS!

Purchase this along with any barrel, and we will headspace barrel and bolt.

In stock


The primary customer of Toolcraft inc. is the U.S. Service Member. This product is the same milspec Carpenter 158 bolt and 8620 steel carrier, with the same treatments as the ones that go to the DOD. Toolcraft then had the carriers, bolts, cam pins and extractors sent to UCT Coatings for the nickel boron coating – the #1 supplier of nickel boron to the military. These have been coated with their proprietary ‘EXO Technology’, which is the best nickel boron process to date. This is a quality first rate product that has come to be expected from Toolcraft. Sold by other companies for much more, these are beautifully finished and guaranteed to not disappoint.

  • M16 Profile
  • EXO Coated Parts Include: Carrier, Gas Key, Cam Pin, Bolt & Extractor
  • Inside Diameter is Coated As Well
  • 5.56mm, .223rem or 300BLK
  • Properly Staked EXO Coated Gas Key
  • Carpenter 158 Bolt, Shot Peened and MPI Tested/Marked
  • Extractor is AISI 4140 Or 4340 Gun Quality, Annealed, Cold Drawn & Stress Relieved To BHN 187/229
  • Properly Heat Treated/Quenched Milspec 8620 Steel
  • Proprietary EXO Coating (Nickel Boron)
  • CNC Machined To Exacting Specifications
  • Satisfaction Guaranteed
  • 100% U.S. Made in North Carolina



4 reviews for Bolt Carrier Group – Toolcraft M16 Nickel Boron EXO Technology

  1. Joseph (verified owner)

    Even though the picture looks like the Bolt and extractor don’t appear NIB coated, they are. This is a great BCG. One of the best I have used. You won’t find a better BCG at this price point. Will be buying more while they last.

  2. TJ

    Bought this BCG Christmas of 2015 and it still runs flawless after an unknown round count. Love the coating and it’s still slick as snot.

  3. Ron burgundy

    As stated, the bolt looks un-coated in the pic, but it is coated as well. Now for round count; bought this in June of 2016 and went through 13 carbine courses since. I honestly don’t know round count, but it’s a minimum of 30,000 without a doubt. I’ve replaced barrels and haven’t had to do a thing to this BCG aside from an extractor spring. Color has diminished a bit, but that’s to be expected. This thing rocks.

  4. Left Hand Okie

    Best you can get. Wipes clean and the only bcg I will ever use!

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