Nitride C158 BCG

Your Price: $169.95
In Stock
Part Number:MA-NIT-C158-BCG
The MA Bolt Carrier Group - Auto Version - for your M4 or AR15.  Machined to USGI specifications. This M16/M4 Carrier includes the proper Mil-Spec Gas Key. The Gas Key Heat Treated per USGI specifications. The Gas Key is secured to the Carrier with Vibra-TITE - 54110 & OCKS Fasteners, properly staked per Military-Specifications. These properly hardened parts insure a strong staking and proper Gas System functioning. The Bolt Assembly is machined from Mil-Spec Carpenter 158 Steel, Shot Peened for increased strength and includes Tool Steel machined Extractor and Ejector, Sprinco Extractor spring, Sprinco Ejector Springs and is High Pressure Tested and Magnetic Particle Inspected. 

  • M16 8620 Tool Steel Carrier
  • MA Shield Logo Laser Engraved
  • Carpenter 158 Steel
  • Heat Treated
  • Shot Peened
  • HPT Bolt - High Pressure Tested 
  • MPI Bolt - Magnetic Particle Inspected
  • S7 Tool Steel Extractor
  • Sprinco Extractor Spring
  • Sprinco Ejector Spring
  • 8620 Gas Key Hardened to USGI Specifications
  • OCKS (Optimized Carrier Key Screws) Fasteners
  • Key Staked Per Mil-Spec using Vibra-TITE - 54110
  • 8640 Steel Firing Pin and Nitrided for corrosion resistant
  • 8620 Cam Pin with directional arrow lasered on
  • Machined to USGI Specifications
  • H&M Black Nitride finish
  • Bolt Comes Pre-Lubed with our house blended lube.

The warranty is NOT transferrable and is only valid to the original purchaser.

Each BCG is individually test fired (3rds of ARMSCOR 223REM 55GR) BCG will ship as is, BCG was lubed and might be dirty from the test firing procedure.

The Modern Armory Bolt Carrier Group is proudly MADE IN THE USA by hard working American men and women.

*Lifetime Guarantee covers manufacturing defects in materials and workmanship, regardless of the age of the product, but it does not cover normal wear and tear. Wear and tear is damage that naturally and inevitably occurs as a result of normal use.

ITAR: International Traffic in Arms Regulations Controlled

5 Stars
Excellent BCG. I’ve come to appreciate the attention to detail in assembly of a solid BCG. The gas key prep, OCKS screws, staking, Sprinco springs, and excellent finish separate MA BCGs from the others. Perfect for hard working duty rifle builds.
Did you find this helpful?  2 of 2 Found Helpful
Reviewed by:  from Rochester Michigan. on 8/27/2020
5 Stars
The quality and attention to detail is second to none , I would highly recommend it
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by: (Verified Buyer)  from Colorado . on 7/8/2020
5 Stars
First MA BCG won’t be my last. Great customer service.
Did you find this helpful?  0 of 1 Found Helpful
Reviewed by:  from Merica . on 10/20/2020
5 Stars
Great bcg. Love the OCKS screws, the sprinco springs, and the finish. Makes it well worth the price.
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Reviewed by: (Verified Buyer)  from Idaho. on 6/2/2020
5 Stars
Solid BCG
This is by far one of the best BCGs I own, Ran it with the lube that came on it cause I forgot to lube. I thought it would be ruined, came out without a scratch. I recommend this to anyone that wants a solid BCG.
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Reviewed by:  from Texas. on 5/30/2020

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