MA Carpenter 158 BCG

MA Carpenter 158 BCG

Your Price: $149.95
Retail Price:$159.95
You Save:$10.00(6%)
In Stock
Part Number:MA-C158-NIT-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 620 Loctite & 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, XD Sprinco Extractor & Ejector Springs and is High Pressure Tested and Magnetic Particle Inspected. Nitrided by H&M Blacknitride+

  • M16 8620 Tool Steel Carrier
  • MA Shield Logo Laser Engraved
  • Carpenter 158 Steel
  • Shot Peened
  • HPT Bolt - High Pressure Tested 
  • MPI Bolt - Magnetic Particle Inspected
  • S7 Tool Steel Extractor
  • Sprinco 5 Coil XD Extractor Spring
  • Sprinco Ejector Spring
  • 8620 Gas Key Hardened to USGI Specifications
  • OCKS (Optimized Carrier Key Screws) Fasteners
  • Key Staked Per Mil-Spec using 620 Loctite
  • 17-4 Stainless Firing Pin
  • 8620 Cam Pin with directional arrow lasered on
  • Machined to USGI Specifications
  • Fully Demagnetized 
  • Nitride by H&M BlackNitride+
  • Bolt Comes Pre-Lubed with Cherryblamz BRB

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
Badass BCG
I've purchased a few of these Bolt Carrier Group from Modern Armory. I shot the shit out of them unsuppressed and suppressed, still holding strong . One of the BCG's has over 5,000 rds and still going strong.
Did you find this helpful?  2 of 2 Found Helpful
Reviewed by: (Verified Buyer)  from Johnstown, Colorado. on 7/19/2018
5 Stars
Worth Every Penny
This bcg is worth every penny and many more, I love the C158 bolt and Sprinco springs. So far only 1k rounds on it but this thing is a beast. Thanks again Modern Armory for the great CS.
Did you find this helpful?  2 of 2 Found Helpful
Reviewed by: (Verified Buyer)  from Houston. on 7/15/2018
5 Stars
Great Bolt Carrier Group
I purchased this a few months back and haven't had a single problem, shot about 500 rds and slight finish wear but that could be lack of lube. Love the products on here and it is always great to talk with Don.
Did you find this helpful?  2 of 2 Found Helpful
Reviewed by:  from Alabama. on 6/20/2018
5 Stars
Great BCG!
We run Modern Armory BCG’s in one of our 10.5” Post sample, suppressed, machine guns. This BCG gets ran hard & cycles like a dream. Great staking, great components & no questioning it’s quality. Will definitely be adding more to our collection.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from Grain Valley, MO. on 7/25/2018

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