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Toolcraft Black Nitride BCG 556

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15 units
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Free Shipping on all Toolcraft Bolt Carrier Groups! 

Toolcraft Inc. is an OEM manufacturer of bolt carrier groups (BCGs) for many AR15 makers. These companies know they can trust Toolcraft quality and are proud to have their logos applied to Toolcraft BCGs. Toolcraft products are also trusted by the U.S. Military and carry a lifetime warranty.

Finish is Black Nitride which is a metal treatment that produces a case-hardened surface. The resulting finish is extremely wear and corrosion resistant. It is also very slick, especially compared to the traditional phosphate finish. This means that all contact surfaces of the BCG will experience less friction and smoother, more reliable function. Easy clean-up of this smooth surface is a nice bonus. The rich black color on these BCGs looks great on the Black Rifle!

See our views of all Toolcraft BCGs here - Toolcraft Gallery

Reviews: With over 2000 5-Star Reviews, the Toolcraft Black Nitride BCG is one of our best reviewed products! Again and again, shooters just like you have been won over by the quality and value of Toolcraft products.

You can see our own review here: Toolcraft BCG Review - Best Black Rifle Secret Ever?


Questions? See Toolcraft FAQs.

Looking for an upgraded finish? See our Nickel Boron and Diamond DLC BCGs, also by Toolcraft.

Want more info on all the various finishes? See our blog post: Best AR15 BCG Finishes

This is a .223/5.56/300 Blackout bolt carrier group.

This AR BCG will not work with 6.5/6.8/308 etc.

Bolt Shot Peened; MPI
Bolt Material 9310 or Carpenter 158 (C158) Steel
Bolt Finish Black Nitride
Caliber .223 | 5.56 NATO | 300 Blackout
Extractor O-ring Viton; Mil Spec
Carrier Material 8620 Steel, Toolcraft Proprietary
Carrier Finish Black Nitride
Carrier Design M16 Full Auto Style
Gas Key Material 4130 Steel
Cam Pin Material 4140 Steel
Cam Pin Finish Black Nitride
Firing Pin Material 8740 Steel; Hard Chrome Plated
Manufacturer Toolcraft


Note: Some dealers are selling Toolcraft BCGs that have been finished after leaving Toolcraft. The finish on those BCGs would not be warrantied by Toolcraft. All Toolcraft bolt carrier groups sold by SpiceTac include the 100% no-questions-asked Toolcraft warranty.

Customer Photos

Below: Toolcraft Black Nitride bolt up close showing Magnetic Particle Inspection (MPI) mark. Note: Markings on Toolcraft bolts vary. Sometimes they are marked, sometimes they are not.

 toolcraft-ar-15 bcg for sale

Below: Bet-your-life reliability (1100 rounds without cleaning) from this AR pistol build using an Aero Precision Upper, Ballistic Advantage 11.3 Hanson 556 NATO barrel, , Toolcraft Black Nitride BCG, Radian Weapons  Raptor charging handle, and SBA3 pistol brace. ARs can be incredibly reliable when properly assembled with quality parts.    


Below: Following an 1100 round reliability test with a Toolcraft BCG, Federal M193 and Wolf Gold ammunition. Dirty but reliable. The nitride finish is hard and slick requiring minimal lube to run reliably. All ammo purchased in bulk from Palmetto State Armory!


Below: AR pistol build using a SB Tactical SBA3 brace, old-school cool 1913 picatinny quad rails and a Toolcraft Black Nitride Bolt Carrier Group


Below: Short AR15 (pistol build) with Toolcraft bolt carrier group and free float rail


Below: Scoped AR15 rifle for accurate long range shooting using reliable Toolcraft BCG


Below: AR-15 pistol build using M-LOK free float rails and Black Nitride Toolcraft bolt carrier group


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