Bolt Carrier Group – Toolcraft M16 Nickel Boron EXO Technology

Rated 5.00 out of 5 based on 6 customer ratings
(6 customer reviews)

$159.99 $134.95

We ship same day or next…ALWAYS!

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

3 in stock


This batch DOES have the 1B1B6 cage code

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. Marked with their military cage code 1B1B6.

  • 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)
  • Marked w/ Military Cage Code 1B1B6
  • CNC Machined To Exacting Specifications
  • Satisfaction Guaranteed
  • 100% U.S. Made in North Carolina



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

  1. Rated 5 out of 5

    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. Rated 5 out of 5


    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. Rated 5 out of 5

    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. Rated 5 out of 5

    Left Hand Okie

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

  5. Rated 5 out of 5

    Jerry (verified owner)

    Bought one a couple years ago for a build, ordered another tonight for my AR pistol and had a buddy of mine order one as well. You don’t need to spend a ton of cash on a BCG because it has an insignia on it, buy it because it works… And this baby works!

  6. Rated 5 out of 5

    Mike (verified owner)

    Best BCG out there have 4 no problems. Great customer service Interegrity Arms too.

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